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Rem4 x 3.14 ember the Circle Equations

C = 2 pi r

A = pi r^(2)

If 'r' (radius) = 2 units then

C = 2 pi x 2 = 4 x pi = 4 x 3.14 = 12.56 units.

A = pi 2^(2) = 3.14 x 4 = 12.56 units^(2)

NB pi = 3.141592.... It is an irrational constant. However, when learning circle equations you are usually given pi = 3.14 , or 3.1416 or 22/7, These are only approximations given for ease of learning.

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lenpollock

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7mo ago

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If your radius was 2. And you were looking for the area of a circle, you would mutliply Pi by 4.

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Wiki User

14y ago
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Q: Why is pi in math multiplied by 4?
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