Area of a Circle

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. Hacking, crafting, mining & more… just another ...more

Google+ is the greatest social network to emerge since Facebook annoyed everyone into joining, but that doesn't necessarily mean that our relationship with it is all rosy. Although Google+ has amazing innovations, like hangouts and circles, users are spending a lot of time beg ...more

Last Thursday, on October 7th, indie game developers from around the world walked down a red carpet in Santa Monica, California in the hopes of winning an IndieCade award. We previously discussed the IndieCade festival and conference, but the award show is a smaller, more incl ...more

Making your own circuit boards can be a daunting challenge. You have to design a schematic, test it on a breadboard, design the board layout, and then after all of that, you still have to print and etch a board! Luckily, we have Fritzing. Fritzing is a free open-source PCB d ...more

Welcome to Minecraft World! Check out our advanced tutorials and come play on our free server. VoxelSniper is one of many very useful world editing plugins available to Minecraft servers. In my opinion, it is one of the best and certainly the most used of all server side plug ...more

Today's post is a small go-to guide for beginner programmers in Null Byte. With many of our community members picking up programming from our Community Bytes, it only makes sense to lay out a one-stop guide for your reference. Hopefully this guide will help you make an educate ...more

It is easy to use too much product when trying to cover dark under eye circles and blemishes. Here we give some tips on how to apply these products in moderation. For Dark Circles: Eye Gel: Use an eye gel or cream to help reduce the appearance of under eye circles and puffin ...more

Want a buff bod? No need to workout! Just follow these steps to exfoliate and get beautiful, glowing skin. Loofah You need to determine your skin type. If it is sensitive, then use a loofah glove with a body wash. Example: Olay Ultra Moisture Body Wash with Shea Butter Clea ...more

With the new iPhone X, Apple introduced a buttonless design for the first time. But without a home button, navigation within iOS 11 had to change to accommodate the new model. To solve this issue, Apple created gestures to perform the actions that the home button once executed ...more

A hemisphere is sphere that has been cut in half. When you cut the sphere in half you are left with the great circle, plus half of a sphere. This fact can be used to find the area, and the volume of a hemisphere. The video works several example problems in which the area and v ...more

The sector area is a section of the circle. You can think of it as finding the area of a pizza slice instead of the entire pizza. The formula equals: The angle measure/360 x pi x radius squared. Video: .

The widget selection on Android is one of the main things that set it apart from other mobile operating systems. You can get quick, at-a-glance information for topics like weather, news, music, and much more, all without ever leaving your home screen. Don't Miss: 12 of the B ...more

The updated Reminders app in iOS 13 makes productivity a little bit more seamless on the iPhone. The overhauled user interface makes it easier to find your reminders, the new Messages integration makes it simpler to remember to-dos regarding your contacts, and the new toolbar ...more

The iPhone X has a new unlocking mechanism called Face ID, which replaces the old Touch ID system since the phone no longer has a fingerprint sensor. The way it works is simple — you just look at the phone, it recognizes your face, then the system unlocks — so Apple deserves t ...more

Over 6,500 waterfowl—mostly ducks—have died in Canyon County, Idaho, stricken by avian cholera. The outbreak started in February, and before it's over, it may not only be Idaho's largest outbreak, but one of the largest in the country. Avian cholera is caused by infection wit ...more

Getting constant dark circles under your eyes? In addition to applying witch hazel or vitamin E oil to the area beneath your eyes, you can also elevate your head with two or three pillows while you sleep so that the blood doesn't pool beneath your eyes. To keep your eyes from ...more

I always found that those safety lights for bicyclists on the market were never good enough when riding in the dark. That got me thinking about people who use wheelchairs and how unsafe the night could be when they want to go out. So here's what I came up with: I decked out t ...more

There is nothing more stunning than accentuating eyes with smokey makeup for a special occasion. Here's a tutorial for you on how to get smokey eyes for a stylish evening or a sophisticated day look in less time. Great for beginners. Video: . Step 1: Apply Base Coat Firstly, ...more

Unless your work clothes require dry cleaning, you probably only go to the cleaner a few times a year. And for those few items in your closet for which you do, you have to then find the time and extra budget to make a trip all the way to the cleaners and back again. In the end ...more

There are many ways you can protect your computer from unwarranted access. For instance, you can use Lockscreen Pro to lock your Windows 8 computer and then have the program snap a photo of the culprit using your webcam. But if you want an even simpler and possibly more effec ...more

Hello! Today I would like to introduce a simple tiny braid - so called the small wrap up. I recommend it to every person who wants to prevent the hair from falling onto the face. It is suitable especially for the people who have long or medium sized hair and very delicate skin ...more

Need to find some directions? No problem, use Google Maps. Want to find some spy photos of yourself? No problem, use Google Street View. Beginning in 2007, hordes of Google hybrid electric vehicles have stormed the streets, each equipped with multiple cameras attached to a la ...more

The Pixel 4 comes with a new "Styles and wallpapers" app that lets you change icons, accent colors, and more. But if you're on a first-gen Pixel, a Pixel 2, or a Pixel 3, you don't get this feature. On the bright side, there's still a way to use it. Your circular home screen ...more

It feels strange to be walking through an open field in a small village in the English countryside. There's no one else around — just the four of us: me, my husband, my 12-year-old son, and my adult niece. The day is spectacular, particularly for England. The sun is shining, a ...more

If you've seen, heard, or even tried the latest virtual reality headsets, you've probably heard about something called "room scale." It's why the HTC Vive suddenly usurped the reign of the Oculus Rift while no one was looking, and it's exactly where Oculus hopes to catch up. H ...more

We've all been there: slipping on a pair of perfect yet slightly uncomfortable shoes, hoping they'll stretch to fit perfectly. After about 30 minutes of wear, suddenly those fantastic shoes aren't feeling very great. By the end of the day, your poor feet are covered in throbbi ...more

When it comes to making pancakes in the morning, most of us probably follow the instructions on the box. Mix all the ingredients together, pour onto a hot greased pan, and form perfect circular flapjacks one by one. But pancakes are so much more than that. You can turn them i ...more

Looking back at my childhood in the '90s, I can't help but feel like I was deceived. Movies that took place in the "future," like in the year 2015, would showcase awesome technology. You know, self-driving or flying cars, hoverboards, and virtual displays controlled with hand ...more

We live, work, and play in drastically different environments, so it only makes sense that we'd want our Nexus 5 smartphones to automatically adapt to our needs when in certain locales at certain times. If you're at home, you want Wi-Fi enabled so that it will connect automat ...more

I'll be the first to admit how horrible my memory is, whether it's remembering to take out the garbage or paying a bill on time. That's why I regularly utilize the stock Reminders app on my iPhone; it's definitely compensated for my memory deficiencies. However, setting a spe ...more

Video: . Video: . Video: . Video: . Video: . Video: . Just because you're drawing a cartoon version of your zombie, doesn't mean you should forget your anatomy and do a rush job. Take your time. Practice anatomy. This is very important for regular human characters and zom ...more

The Galaxy S9 is full of minor improvements and revisions that come together to make it a worthy upgrade over the Galaxy S8. One such improvement is facial recognition, which Samsung has fortified with machine learning and the inclusion of another sensor. The result of these e ...more

Flight disruptions can cost billions of dollars, but most modern commercial flights rely on air traffic control systems that harbor serious vulnerabilities. The Federal Aviation Administration uses an infrastructure called NextGen, which relies on Automatic Dependent Surveilla ...more

There are many different ways and many different apps that allow you to censor a racy photo and then share it to Instagram or Facebook. If you're in a time crunch and don't have the time or the patience to deal with something like Photoshop, then Snapseed is a great and easy a ...more

If you want free Poké Balls and eggs when playing Pokémon GO, you can find them at PokéStops in variation locations around your city, which are marked with towering blue icons on your map. Once you're at Level 5, they'll also grant you Potions and Revives to help you in your b ...more

As someone who's dependent on glasses to see on an everyday basis, losing or misplacing them is obviously a bad thing. I can't even see clearly enough to find the glasses that I just lost, so I'm pretty much blind now. Without your prescription eyewear, the world is a blur. P ...more

Automating tasks on your Samsung Galaxy Note 2 is nothing new. Everything from adjusting screen brightness, to turning on the flashlight, to saving Snapchat pictures can be done automatically with the help of a few function-specific apps. The only problem with task-specific ap ...more

Video: . Video: . Video: . Video: . Step 1: In This Four Part Tutorial We Will Learn How to Draw Two Eyes. Let's Begin with a Straight Line, Which Will Serve as a Horizon Line and Will Give Us an Idea Where the Shapes Are Going to Be. Then We Should Draw a Vertical Line to ...more

Ever typed out a long message on your phone only to find several errors after you hit send? Proofreading would fix this, but anyone who's spent time trying to edit on a smartphone knows how difficult it is. Thankfully, Gboard makes this task easier. Gboard has a text editor f ...more

The Pixel 4 and 4 XL are the first Android phones released in the US to support secure facial recognition. You no longer have to hate on your Apple's friends because you now have "Face ID" as well. So I assume you want to set it up right away — here's how. The new facial reco ...more

Facebook had a pretty big week in terms of augmented reality, with much of its news coming from the Oculus 6 keynote presentation. But Mark Zuckerberg's social media company found other areas of impact outside of Oculus 6 as well. Meanwhile, Unity also had its own keynote pre ...more

Starting in iOS 13, Apple introduced a robust suite of video-editing tools to its Photos app. The majority of editing tools were only available for images in iOS 12 and older, but iOS 13 leveled the playing field to allow even a novice to tweak videos like a pro before sharing ...more

YouTube's mobile live streaming feature is great for connecting with your audience in a more personal way than traditional videos provide. Audiences can view and respond to content in real time, and creators can do the same. While unfortunately not available to everyone — you ...more

Snapchat's newest feature will allow you to see where your friends are posting from around the world. Called Snap Map, this easy-to-use update gives users the ability to view your friends' stories and locations on a map. Snap Map works by recording your location when you open ...more

The popular beauty app company Meitu is incorporating augmented reality (AR) video and image filters and effects in its selfie-editing app BeautyPlus for iOS and Android. Meitu has now added over 20 augmented reality filters to the app, which already was able to do smart reto ...more

Any other person can make plain pancakes... but only the most awesome of cooks can make stuffed pancakes. Luckily, this isn't a tough technique—in fact, it's so easy that you'll find yourself getting bored of the run-of-the-mill pancakes and dreaming of all the things you can ...more

Text input on a touchscreen device is constantly evolving. From early beginnings of pecking out each individual character to today's predictive text and gesture keyboards, we've already come a long way. But text selection is still lacking. If you've ever tried to quote multip ...more

Your new HTC One M8 has a ton of really cool features, some of which relate to waking the device up. A swipe up to unlock to your last active screen, a swipe down to access the voice dialer, and a double-tap (or knock) to wake the device and bypass the lock screen. But the on ...more

It's time to trip out with your tablet. If you're not looking to drain that precious battery life with a fancy-looking live wallpaper, then apply an optical illusion that appears to be moving on your Nexus 7 (or any other Android device) instead. Many of these visual illusion ...more

When you think of nail polish, it's probably almost always in the context of a manicure. I mean, that's what it's made for, right? But there are plenty of other things you can use clear or colored nail polish for besides painting your nails. Even if you're a guy living on his ...more

Cross-dressing and gender-bending are nothing new, but the realm of Steampunk seems to be especially accepting of role-reversal in dress. As steampunk grows into an entity unto itself, we are seeing issues such as multiculturalism and erotica being addressed. This expansion o ...more

Document scanning is possible via the Google Drive app, but my brain doesn't think of opening a cloud storage app to scan a document. I usually just open the camera app and take a picture instead — and apparently, I'm not the only one. Google has added a feature to the Pixel' ...more

Using a green screen is an affordable and easy way to transport your video to anywhere imaginable, even to places that don't exist. You can use it to sit behind a desk in a busy newsroom or dance on the moon, but first, you have to know how to properly perform chroma key compo ...more

It's difficult to find that perfect lighting when you're taking a photo. You won't always have studio lights — or at all — and you're not always out during golden hour. So how can you combat lighting issues without waiting around for a well-lit condition? Do it in post. Adobe' ...more