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anonymous
 4 years ago
WHAT IS THE AREA OF A CIRCLE WITH THE CIRCUMFERENCE OF 31.4CM?
anonymous
 4 years ago
WHAT IS THE AREA OF A CIRCLE WITH THE CIRCUMFERENCE OF 31.4CM?

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pottersheep
 4 years ago
Best ResponseYou've already chosen the best response.1Think about it. Whats the formula for circumference?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0\[circumference = 2 \pi r\]find r then \[area = \pi r^2\]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0for finding area we need value of radius .... circumference = 2πr Area = πr^2

pottersheep
 4 years ago
Best ResponseYou've already chosen the best response.131.4CM =2πr r = 4.99

pottersheep
 4 years ago
Best ResponseYou've already chosen the best response.1Get it? Cuz 31.4CM divided by 2 divided by π gives you r

pottersheep
 4 years ago
Best ResponseYou've already chosen the best response.1Round that number to 5.

pottersheep
 4 years ago
Best ResponseYou've already chosen the best response.1Now plug the new radius into the area formula

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0pottersheep has just established that:\[\text{area of a circle}=\frac{c^2}{4 \pi }\]
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