307.75=3.14*r^2

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Solution for 307.75=3.14*r^2 equation: 


Simplifying
307.75 = 3.14r2

Solving
307.75 = 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.
307.75 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
307.75 + -3.14r2 = 0.00

Add '-307.75' to each side of the equation.
307.75 + -307.75 + -3.14r2 = 0.00 + -307.75

Combine like terms: 307.75 + -307.75 = 0.00
0.00 + -3.14r2 = 0.00 + -307.75
-3.14r2 = 0.00 + -307.75

Combine like terms: 0.00 + -307.75 = -307.75
-3.14r2 = -307.75

Divide each side by '-3.14'.
r2 = 98.00955414

Simplifying
r2 = 98.00955414

Take the square root of each side:
r = {-9.899977482, 9.899977482}

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