8=3.14*r^2

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Solution for 8=3.14*r^2 equation: 


Simplifying
8 = 3.14r2

Solving
8 = 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.
8 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
8 + -3.14r2 = 0.00

Add '-8' to each side of the equation.
8 + -8 + -3.14r2 = 0.00 + -8

Combine like terms: 8 + -8 = 0
0 + -3.14r2 = 0.00 + -8
-3.14r2 = 0.00 + -8

Combine like terms: 0.00 + -8 = -8
-3.14r2 = -8

Divide each side by '-3.14'.
r2 = 2.547770701

Simplifying
r2 = 2.547770701

Take the square root of each side:
r = {-1.596173769, 1.596173769}

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