764.1504=3.14*r^2

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Solution for 764.1504=3.14*r^2 equation: 


Simplifying
764.1504 = 3.14r2

Solving
764.1504 = 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.
764.1504 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
764.1504 + -3.14r2 = 0.00

Add '-764.1504' to each side of the equation.
764.1504 + -764.1504 + -3.14r2 = 0.00 + -764.1504

Combine like terms: 764.1504 + -764.1504 = 0.0000
0.0000 + -3.14r2 = 0.00 + -764.1504
-3.14r2 = 0.00 + -764.1504

Combine like terms: 0.00 + -764.1504 = -764.1504
-3.14r2 = -764.1504

Divide each side by '-3.14'.
r2 = 243.36

Simplifying
r2 = 243.36

Take the square root of each side:
r = {-15.6, 15.6}

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