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Simplifying
658 = 3.14r2
Solving
658 = 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.
658 + -3.14r2 = 3.14r2 + -3.14r2
Combine like terms: 3.14r2 + -3.14r2 = 0.00
658 + -3.14r2 = 0.00
Add '-658' to each side of the equation.
658 + -658 + -3.14r2 = 0.00 + -658
Combine like terms: 658 + -658 = 0
0 + -3.14r2 = 0.00 + -658
-3.14r2 = 0.00 + -658
Combine like terms: 0.00 + -658 = -658
-3.14r2 = -658
Divide each side by '-3.14'.
r2 = 209.5541401
Simplifying
r2 = 209.5541401
Take the square root of each side:
r = {-14.475984944, 14.475984944}
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