45=3.14*r^2

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Solution for 45=3.14*r^2 equation: 


Simplifying
45 = 3.14r2

Solving
45 = 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.
45 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
45 + -3.14r2 = 0.00

Add '-45' to each side of the equation.
45 + -45 + -3.14r2 = 0.00 + -45

Combine like terms: 45 + -45 = 0
0 + -3.14r2 = 0.00 + -45
-3.14r2 = 0.00 + -45

Combine like terms: 0.00 + -45 = -45
-3.14r2 = -45

Divide each side by '-3.14'.
r2 = 14.33121019

Simplifying
r2 = 14.33121019

Take the square root of each side:
r = {-3.785658488, 3.785658488}

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