- A circle is known as a round plane figure whose boundary (the circumference) consists of points equidistant from a fixed center.
- There are circles EVERYWHERE, seriously. Look at anything right now, & i will guarantee you can find a type of circle. For example is you have the iPhone, here's some circles on your phone (that you probably never let go of) :
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| These are just SOME circles on the iPhone. Even the circles i drew on there are CIRCLES man ! |
- Now when finding the area of a circle, its just a little tricky. This is because there's 2 formulas for a circle. There's circumference (perimeter for circles) & area, but they're 2 different things. But they do have one thing the same, PI.
- For circumference, you multiply the radius by 2 or multiply the diameter by Pi. Or go by the rule of either 2πr or πd. Either way they're both the same.
- For area you'll square the radius and multiply it by Pi. Or the rule is πr².
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| The pink/purple shaded part of the circle (inside), is the area of a circle. |
- Here's an example of finding the area & circumference of a circle :
- So now that you've got everything packed down on area & circumference ... try this problem out :
- What is the area of the colored part this circle ?
Sources Cited:
Area= 64(pie) or 205.696 :)
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