62.8=3.14*r^2

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Solution for 62.8=3.14*r^2 equation: 


Simplifying
62.8 = 3.14r2

Solving
62.8 = 3.14r2

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '-3.14r2' to each side of the equation.
62.8 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
62.8 + -3.14r2 = 0.00

Add '-62.8' to each side of the equation.
62.8 + -62.8 + -3.14r2 = 0.00 + -62.8

Combine like terms: 62.8 + -62.8 = 0.0
0.0 + -3.14r2 = 0.00 + -62.8
-3.14r2 = 0.00 + -62.8

Combine like terms: 0.00 + -62.8 = -62.8
-3.14r2 = -62.8

Divide each side by '-3.14'.
r2 = 20

Simplifying
r2 = 20

Take the square root of each side:
r = {-4.472135955, 4.472135955}

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