What is the area of a circle with radius of 10 cm?

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13
Dec 23, 2015

Answer:

314.16 #cm^2#

Explanation:

The formula for the area of a circle is given by:
Area = #pi##r^2# , r = radius

Therefore, you only need to substitute radius into the equation and calculate the area using calculator.

Area = #pi##r^2#, r = 10 cm
Area = #pi##10^2#
= 314.16 #cm^2#

However, sometimes the question will give you the #pi# as 3.142 or #22/7#, so your answer might varies a bit with the actual calculation. Let's proof it for you! :D

Area = 3.142 x #10^2#
= 3.142 x 100
= 314.2 #cm^2#

Area = #22/7# x #10^2#
= #22/7# x 100
= #2200/7# [You can leave your answer in this form]
= 314#2/7# #cm^2#

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