Suppose the circumference of a circle is 2 pi what is the area?

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04-05-2015
Mathematics

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Suppose the circumference of a circle is 2 pi what is the area?

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find the circumference of a circle whose radius is 15.4cm

iGreen iGreen · Answer 1 · 2015-05-04T14:46:25+02:00

iGreen iGreen

04-05-2015

C = 2 * pi * r

Plug in what we know:

2pi = 2 * pi * r

Divide 2 pi to both sides:

r = 1

(Remember, anything divided by itself is equal to 1)

A = pi * r^2

Plug in what we know:

A = pi * 1^2

A = pi * 1

A = 1 pi

So the area is '1 pi' or just 'pi'.

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