75.27=3.14*r^2

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Solution for 75.27=3.14*r^2 equation: 


Simplifying
75.27 = 3.14r2

Solving
75.27 = 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.
75.27 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
75.27 + -3.14r2 = 0.00

Add '-75.27' to each side of the equation.
75.27 + -75.27 + -3.14r2 = 0.00 + -75.27

Combine like terms: 75.27 + -75.27 = 0.00
0.00 + -3.14r2 = 0.00 + -75.27
-3.14r2 = 0.00 + -75.27

Combine like terms: 0.00 + -75.27 = -75.27
-3.14r2 = -75.27

Divide each side by '-3.14'.
r2 = 23.97133758

Simplifying
r2 = 23.97133758

Take the square root of each side:
r = {-4.896053266, 4.896053266}

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