136.7784=3.14*r^2

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Solution for 136.7784=3.14*r^2 equation: 


Simplifying
136.7784 = 3.14r2

Solving
136.7784 = 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.
136.7784 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
136.7784 + -3.14r2 = 0.00

Add '-136.7784' to each side of the equation.
136.7784 + -136.7784 + -3.14r2 = 0.00 + -136.7784

Combine like terms: 136.7784 + -136.7784 = 0.0000
0.0000 + -3.14r2 = 0.00 + -136.7784
-3.14r2 = 0.00 + -136.7784

Combine like terms: 0.00 + -136.7784 = -136.7784
-3.14r2 = -136.7784

Divide each side by '-3.14'.
r2 = 43.56

Simplifying
r2 = 43.56

Take the square root of each side:
r = {-6.6, 6.6}

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