How to Find Missing Angle on Triangle

How To : Find a missing angle outside of a 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

How To : Find a missing angle inside of a triangle

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

How To : Find a missing vertical angle

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

How To : Find a missing angle in a parallelogram

Could you use a little help figuring out how to find an unknown angle in a paralellogram? Watch this free video geometry lesson. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And ...more

How To : Use a protractor in geometry

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

How To : Use the Pythagorean Formula to find a missing side

The Pythagorean theorem is a simple theorem that states that - for a right angled triangle the square of the length of the hypotenuse is equal to the sum of the squares of the length of the remaining two sides. In this video, a right angled triangle with three sides, namely a ...more

How To : Find the sine, cosine & tangent of an angle in trig

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

How To : Find the interior & exterior angles of a triangle

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

How To : Use inverse functions in trigonometry

Inverse trig functions are used to find missing angles rather than missing sides. This video explains how to use inverse trig to find a missing angle. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belong ...more

How To : Find the areas of a parallelogram and a triangle

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

How To : Use the Cosine Law

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

How To : Understand the Pythagorean Theorem

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

How To : Understand the CAH formula

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

How To : Find the length of a side of a triangle using sine

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

How To : Derive the area of a circle

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

How To : Classify a Triangle as an Isosceles Triangle.

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

How To : Pythagorean Theorem

What Is Pythagorean Theorem? Pythagorean Theorem is an equation discovered by a man named Pythagoras. It can be used to determine whether or not a triangle is a right triangle and find missing lengths of a triangle. The equation is: Parts of a Triangle The hypotenuse is the ...more

How To : Do Pythagorean Theory

The Pythagorean Theory is a way to find the missing length of a right triangle. Here is a right triangle with a description. The Formula for Pythagorean's Theory is A squared + B squared = C squared. If the hypotenuse is missing then you would use the formula above. If one of ...more

How To : Solve the Rubik's Cube faster with shortcuts

As the best-selling toy of all time, the odds of you once playing with a Rubik's Cube are pretty high. And if you're like me, or even the cube's inventor Erno Rubik, your first attempts likely ended in futility. Every twist, every turn, the cube just gets more and more mixed u ...more

How To : Hang Curtains Without Making Holes in the Wall

For anyone who lives in a space that may frown upon making holes in the walls, or for anyone who may not want to take on such a task, there's a simple alternative to hanging curtains or drapes. And the answer is brilliantly simple. Look no further than 3M Command hooks. Yes, ...more

How To : Carve Polyhedral Pumpkins

Halloween is coming up, so many of you may have a need or desire to carve a pumpkin and turn it into a Jack O' Lantern. This week we are going to explore carving our pumpkins into interesting geometric shapes. In this post, we will carve the pumpkins into spherical versions of ...more

How To : Use the TOA formula in trigonometry

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

How To : Use a formula to find the area of a parallelogram

This video shows us how to use a formula to find the area of a parallelogram. The formula for finding the area of parallelogram is the same as finding the area of rectangle or a square which is equal to length time’s breadth. But the parallelogram looks a bit different and the ...more

How To : Prove angle-side-angle congruency

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

How To : Embrace the Blur

This is a continuation of a previous post about getting "unfocused" with your DSLR. We all work hard to get pictures that are sharp and have perfect focus. Maybe we’re missing the forest for the trees. Think about mood, color, ideas—in other words, not your gear. There are l ...more

How To : Fill a cone

This is a very interesting instructional video on how to fill a cone. Pour oil into a cone of diameter 30 inches and depth 40 inches. Now find the volume of the oil as a function of its depth. Volume = 1 over 3 phi rsquare h. We don't know the height and depth of the oil poure ...more

How To : Build a solar death ray

Let's build a SOLAR DEATH RAY!!! Step 1: Remove the screws along the edges of your TV making sure not to miss any. (Refer to YouTube repair videos for your model if there are any.) continue to remove screws until you've cleared out enough to remove the screen, and then clear o ...more

How To : Make a Hyperbolic Paraboloid Using Skewers

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

How To : Make a Sonobe Jasmine Dodecahedron

Math Craft admin Cory Poole posted instructions on How to Make a Cube, Octahedron & Icosahedron from Sonobe Units, plus some great complex models in his article, How to Make a Truncated Icosahedron, Pentakis Dodecahedron & More. These models use the standard sonobe unit and a ...more

How To : Draw full body manga characters

If you want to draw full body manga characters you need to make sure you know how to draw legs. First you should draw hid lines in a box and then connect legs. Make sure you have a gap for the legs and that the legs as even. Draw two circles for the buttocks and then draw legs ...more

How To : Use printer paper to make a paper airplane

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

How To : Make 6-Sided Kirigami Snowflakes

We've all made them. I remember making hundreds of paper snowflakes when I was in elementary school. You take a piece of paper and fold it in half, then fold it in half again. You now have a piece that is one fourth the size of the original. Now you fold it in half diagonally. ...more

How To : Things to Do on WonderHowTo (12/07 - 12/13)

WonderHowTo is made up niche communities called Worlds. If you've yet to join one (or create your own), get a taste below of what's going on in the community. Check in every Wednesday for a roundup of new activities and projects. This week: A double exposure cell phone photog ...more

How To : Create Parabolic Curves Using Straight Lines

Curve stitching is a form of string art where smooth curves are created through the use of straight lines. It is taught in many Junior High and High School art classes. I discovered it when my math students started showing me the geometric art they had created. The process of ...more

How To : Get Natural, Sparkling White Teeth on the Cheap

You Want White Teeth Without Expensive Over-The-Counter Products? Here's An Inexpensive, Effective Solution. Everywhere you look there are products for whitening teeth. You could spend a fortune on products you have to use everyday. This tutorial will show you a natural, inex ...more

How To : Derive the area of triangle using trigonometry

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

How To : Find the area of a rectangle using geometry

This video shows how to compute the area of a rectangle given the length of one of its sides and its diagonal. First start by drawing the picture of the rectangle. Now draw the diagonal and label the known lengths. In the diagram, the diagonal and two sides of the rectangle fo ...more

Ranked : The 4 Best Phones for Gaming

Mobile gaming used to mean Game Boy, PSP, Nintendo DS — another device to carry around that usually couldn't replicate the experience of a home console. Well, those days are over. High-quality, powerful games are now available on the phone you already have in your pocket. Whet ...more

VSCO 101 : How to Use the Selfie Camera on Your iPhone

If you've spent countless hours scrolling through Instagram feeds full of selfies, then I'm sure you know that some are, well ... better than others. There are so many different things you can do to start taking better selfies to post on social media. One really easy way is to ...more

News : All the Latest Leaks & Rumors on the Galaxy S10

The Galaxy S9 didn't even hit shelves before fans were already musing about its followup. It's no secret Samsung's newest device, as impressive as it is, is little more than an upgrade to last year's S8. As a result, excitement has begun brewing for what Samsung has in store a ...more

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