This video walks you through the steps of solving a problem that requires us to figure out the area of an equilateral triangle inscribed in a circle. This excellent video shows you a clean blackboard, with the instructors voice showing exactly what to do. Don't fret, any quest ...more

Are math problems getting you down? Well this should be of some help. Here is how to find a missing angle inside of a triangle. Now the first thing to remember when solving this type of question is that the sum of all the three angles inside a triangle is equal to 180 degrees. ...more

Need some help figuring out how to work with angles in geometry? Look no further. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever ...more

A tutorial for the math software GeoGebra on working with a right angle triangle.

For people who are having problems with certain parts of geometry, this video will offer you advice on how to find a missing angle on the outside of a triangle when you are provided with the measurements of the other two angles in the triangle. Since the sum of the angles in a ...more

This video shows you how to easily find the area of a triangle when you know the length of 2 sides and the angle between them. The first thing you have to do is mark the sides of the triangle by a, b, c, where a is the side between A and B, b is the side between B and C and c ...more

This video shows how to solve a very basic yet very important geometric problem which is, finding a missing angle of a triangle. This videos shows the viewers more than one basic information about the triangle. It is a short and simple example which is very much helpful for th ...more

Need help figuring out the sine, cosine, and tangent of an angle in a right triangle? Need to know how to solve a matrix-form linear equation in algebra? Need help solving problems involving 45°-45°-90° right triangles? You're in luck. From Ramanujan to calculus co-creator Got ...more

A 45 45 90 triangle is a special right triangle because you can use short cuts to find leg length and hypotenuse length. This video solves two problems involving leg length and hypotenuse length. Video: . Highlights of the video A 45-45-90 triangle is an isosceles triangle, w ...more

In this tutorial the author shows how to find out the missing side of a triangle which is similar to an other triangle. He explains the concept of similar triangle using diagrams and by showing that similar triangles have equal corresponding angles and parallel sides. Now he l ...more

Learn and understand the basics of Trigonometry in this entertaining video. Taught by an experienced YayMath instructor, viewers gain knowledge in the study of trigonometry: the relationship of angles and the triangles they are in. Trigonometry is relevant in many forms of eve ...more

In this tutorial the author shows how to find out the missing part of a triangle that is similar to another triangle. He explains the concept of similar triangle diagrammatically by showing that similar triangles have similar angles and parallel sides. Now he labels sides of s ...more

The video is a tutorial in trigonometry. The teacher teaches that the tangent or the tan of an angle is the ratio of the opposite side to the adjacent side of a right angled triangle. If one side and one angle is given then the value of the unknown side can be found by solving ...more

In this video tutorial the author shows how to use the Cosine Law. He shows how to find an angle of a triangle where he know all the sides of a triangle, using the cosine Law. He uses a lower case letter to designate a side and a capital letter to designate an angel apposite t ...more

Want to solve for a side of a triangle when 2 sides and an angle are known? Learn how with this free video trig lesson. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks ...more

To find the length of a side of a triangle using cosine, you first need to find the angle and which sides are given. After you determine the angle and given sides, you'll need to figure out which trigonometric ratio to use. If you are given the adjacent side and the hypotenuse ...more

In this math lesson we will investigate easy Pythagorean Theorem proofs and problems. The Pythagorean Theorem takes place in a right triangle. The longest side in a right triangle is called hypotenuse, and the other two sides are called legs. The hypotenuse opposes the right ...more

In order to find the cosine of a triangle in trigonometry, you will need to understand the CAH formula, part of the larger mnemonic of SOHCAHTOA, which outlines how to find the sine, cosine, and the tangent of an angle. The video offers accurate diagrams as well as examples in ...more

Omar, Hayley, Gary, and Autumn teach us how to use a protractor. They give a bit of information from About.com on the history of protractors. They are used to measure angles. The first protractor was used to help with navigation and invented in 1801. To measure an angle, line ...more

Need help figuring out how to determine the length of the sides of a right triangle? Need to know how to solve a matrix-form linear equation in algebra? From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belo ...more

Learn how to graph the amplitude and periods of sine and cosine functions in basic trigonometry. Learn how to use trigonometric functions to calculate the sides of a right triangle. Need to know how to solve a matrix-form linear equation in algebra? From Ramanujan to calculus ...more

In order to create a pin-up Rosy the Riveter look with a bandana, you will need the following: hairspray, bobby pins, round brush, wax or smoothing cream, a bandana, and a curling iron. Once you've got all of that, follow along with Kandee Johnson's video guide below. Video: . ...more

Use geometry to make an adorable and fun heel klickin' friend using McCormick vertex elements! You will need: Cardstock (perfectly squared or rectangular) Ruler Ballpoint pen School glue Scissors Small paintbrush Step 1: Make Lines Take a sheet of card stock and using the t ...more

Fold an origami praying mantis! You need two sheets of paper to join to first sheet on square base. Start folding after making rectangle, after folding the rectangle again from the other direction grebe than on fold. Make a triangle than fold on other direction to make a trian ...more

When a triangle is inserted in a circle in such a way that one of the side of the triangle is diameter of the circle then the triangle is right triangle. To prove this first draw the figure of a circle. Now draw a diameter to it. It can be any line passing through the center o ...more

In this tutorial, we learn how to find the interior and exterior angles of a triangle. I triangle has three angles and their measurement when added together will equal 180. For example, if one angle is 80 and another is 30, then start off saying the equation equals 180. Write ...more

The video teaches the viewer how to find the area of a parallelogram and the area of a triangle. For a parallelogram, the first step is to find the right angle, the line perpendicular to the base (this is a line you draw, not part of the parallelogram). The height of the line ...more

This is a video tutorial on how to prove congruent triangles with SSS and SAS test. SSS means side-side-side and SAS means side-angle-side. For applying the SSS test of congruency, each side of one triangle must be congruent to the corresponding side of the other triangle. For ...more

It's Monday, time to highlight some of the community submissions posted to the Math Craft corkboard. One of these posts inspired me so much, I think it merits a closer look. Today, I present a "simple" method for making a golden spiral using just a straight edge, a compass, an ...more

In this video Ken teaches you about the Pythagorean Theorem. The Pythagorean Theorem is used to find the missing length of a side of a right triangle. By watching this video, you will learn how to find any the length of any side by using a simple mathematical formula. Ken walk ...more

This video shows how to get an equilateral triangle from a square - that is a triangle where each edge has the same length (and each angle has 60 degree). Learn this great origami technique.

Yoga's triangle pose, or trikonasana, is a side angle pose with possible variations that involves a wide stance and a twist. Learn elements of the yoga triangle pose from an instructor in this free yoga video series. Part 1 of 16 - How to Do the yoga triangle pose (trikonasana ...more

Learn how to use printer paper to make a paper airplane. Find a piece of paper shaped like a rectangle. A sheet of computer printing paper or school notebook paper is a good size and weight. Lay the paper on a table with one of the long edges closest to you. Fold the paper in ...more

This video will show you simply how to calculate the area of any triangle using basic geometry formulas. Since a triangle is basically half of a rectangle, the formula for calculating the area of a triangle is base times height. This video offers some insight and examples prov ...more

First you want to find X using the identities given for a 45-45-90 triangle. When comparing the triangles in the video, we find that X must be 6. Next, use the identity to solve for the measurements of the sides of the triangle. In the video example, 6 is the length of the two ...more

Free Math Tutoring teaches you in this video how to calculate the area of a triangle using a basic formula. The area of a triangle is (b times h)/2. B is the base of the triangle and h is the height. This formula works for all kinds of triangles. Sometimes you won't have the h ...more

It's once again Monday, which means it's time to highlight some of the most recent community submissions posted to the Math Craft corkboard. I also thought we'd take a look at building a model that has appeared in numerous posts. It's the simplest of the intersecting plane mod ...more

Watch this short quilting video to cut a 45 degree angle precisely. When sewing quilts with large triangle patterns, cutting your fabrics precisely can be vital to the geometric vitality of your quilt. Follow these instructions to keep your colonial quilt from drifting off cen ...more

In Monday's post, we created a sliceform model of a hyperbolic paraboloid. In today's post, we will create a similar model using skewers. The hyperbolic paraboloid is a ruled surface, which means that you can create it using only straight lines even though it is curved. In fac ...more

This is a tutorial about how to prove the congruency (equality) of two triangles when the values of two angles and an included side of each triangle is given. The author of this video instructs the viewer that it should be first determined whether the values of two angles of o ...more

Need to know how to determine the equations of trigonmetric functions by inspecting their graphs? Learn how. Learn how to use trigonometric functions to calculate the sides of a right triangle. Need to know how to solve a matrix-form linear equation in algebra? From Ramanujan ...more

These are a few examples of my latest craze. It is basically a 3d weave of cocktail sticks—just lots of them. I have made them from chopsticks and skewers as well, but have given those as presents and don't have any pictures. Sticks of the same colour are all parallel to each ...more

This video is about deriving the area of a circle of radius 'r' using polar co-ordinate. First, we draw a circle and its radius 'r'. Then draw another radius close to it, so that it forms a small triangle-like figure. To find the area of the complete circle, divide the circle ...more

In this video you can learn how to fold a modular origami star. Create four quadrants of the star point. Crease and unfold the first square origami paper in half both vertically and horizontally, making four equal quarters. Set the creases. Fold precisely each corner of the sq ...more

This video shows us how to fold a simple origami swan. Here are the following steps: Step 1: First of all take a paper and then crease it diagonally and then open the crease and then fold the paper on the crease line so that a cone is obtained with a triangle on the top. Ste ...more

In this video the author shows us how to find the measure of a central angle when its corresponding arc degree is given. He shows how to solve this kind of problem by solving an example. He states the central angel made by the arc is nothing but the given arc degree and states ...more

In this video tutorial, viewers learn how to make paper footballs. Begin by cutting a straight strip of paper. The wider the width, the larger the football will be. Then fold the edge into a right triangle shape and continue folding the strip in the right triangle pattern. Onc ...more

This video is a demonstration of how to make a Chinese paper star out of newspaper. First take a folded piece of newspaper and fold it in half again the long way, and then again, to make a narrow strip. Fold the strip in half to crease it, then fold the strips at a right angle ...more

In another installment of Math Problem Generator this video shows how to find the area of a trapezoid. First it displays the dimension of the triangle, with the corresponding formula to find the area. This quick and easy demonstration shows how to plug in the correct dimension ...more

In this video tutorial, viewers learn how to find the length of a triangle using sine. This task is very easy, fast and simple to do. This formula can only be done on right triangles. Begin by finding the angle first and figure which trigonometric ratio to use. Then find which ...more

In this video, we learn how to do a bird of paradise yoga move with Dina Priost. This move is an intense pose, so make sure you are properly warmed up before you go into this move. First, start in an extended side angle pose then go into a bind. Make sure your top shoulder is ...more

Most paper snowflakes are not representative of the proper 6-sided shape of snowflakes. This tutorial will show you a method which will allow you to make a beautiful and symmetrical realistic six sided paper snowflake. You will need to start with a square piece of paper, which ...more

Azimuth is simply the angle of an object in the sky along the horizon. Yes, it's spherical trigonometry but it's not difficult! Check out this video and in just a few minutes you will be able to solve azimuth problems on your own. You Will Need: * The latitude and longitude of ...more

This video will walk you through the process of creating your very own icon to use for your email by using Adobe Photoshop. Photoshop is a great tool to use for a variety of purposes and in this instance can make the perfect icon in just minutes. 1. Open New file with 500x500 ...more

If you thought the last post on Two Circle Wobblers was wild, then wait until you see what happens when you build wobblers out of two half circles or two ellipses. In both of these cases, the center of gravity still remains constant in the vertical direction, allowing them to ...more

In this tutorial the instructor shows how to find the area of an oblique triangle using different formulas. To find the area of an oblique triangle there are different formulae. The first formula to calculate the area of a triangle is area A = (1/2) * a * b * Sin(C), where a a ...more

In this video tutorial, viewers learn how to solve the area of a triangle. The formula for the area of a triangle is A = ½ x b x h or bh/2. The base of the triangle is always at the bottom; it is the side that the triangle sits on. The height is the length between the base and ...more

Before you can find the area of any geometrical figure, recall what you are finding when you solve for the area. The area is the surface of a 2-dimensional shape. When trying to find the area of a right triangle, the easiest way is to first double the triangle so that it resem ...more

This video teaches the method to find the area of triangle using law of cosines and law of sines together with the area formula. Law of cosines is used when you have the length of three sides. It states that the square of side 'a' is equal to addition of the squares of sides ' ...more

Video: . What is an isosceles trapezoid. The video goes over the properties that are unique to an isosceles trapezoid. Video Guide :12 Properties of an isosceles triangle explained (Quadrilateral with two parallel sides and two non-parallel sides) :43 Unique properties of an ...more