25=3.14*r^2

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Solution for 25=3.14*r^2 equation: 


Simplifying
25 = 3.14r2

Solving
25 = 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 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
25 + -3.14r2 = 0.00

Add '-25' to each side of the equation.
25 + -25 + -3.14r2 = 0.00 + -25

Combine like terms: 25 + -25 = 0
0 + -3.14r2 = 0.00 + -25
-3.14r2 = 0.00 + -25

Combine like terms: 0.00 + -25 = -25
-3.14r2 = -25

Divide each side by '-3.14'.
r2 = 7.961783439

Simplifying
r2 = 7.961783439

Take the square root of each side:
r = {-2.82166324, 2.82166324}

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