25.12=3.14*r^2

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Solution for 25.12=3.14*r^2 equation: 


Simplifying
25.12 = 3.14r2

Solving
25.12 = 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.
25.12 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
25.12 + -3.14r2 = 0.00

Add '-25.12' to each side of the equation.
25.12 + -25.12 + -3.14r2 = 0.00 + -25.12

Combine like terms: 25.12 + -25.12 = 0.00
0.00 + -3.14r2 = 0.00 + -25.12
-3.14r2 = 0.00 + -25.12

Combine like terms: 0.00 + -25.12 = -25.12
-3.14r2 = -25.12

Divide each side by '-3.14'.
r2 = 8

Simplifying
r2 = 8

Take the square root of each side:
r = {-2.828427125, 2.828427125}

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