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Simplifying
137.8 = 3.14r2
Solving
137.8 = 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.
137.8 + -3.14r2 = 3.14r2 + -3.14r2
Combine like terms: 3.14r2 + -3.14r2 = 0.00
137.8 + -3.14r2 = 0.00
Add '-137.8' to each side of the equation.
137.8 + -137.8 + -3.14r2 = 0.00 + -137.8
Combine like terms: 137.8 + -137.8 = 0.0
0.0 + -3.14r2 = 0.00 + -137.8
-3.14r2 = 0.00 + -137.8
Combine like terms: 0.00 + -137.8 = -137.8
-3.14r2 = -137.8
Divide each side by '-3.14'.
r2 = 43.88535032
Simplifying
r2 = 43.88535032
Take the square root of each side:
r = {-6.624601899, 6.624601899}
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