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Simplifying
251.2 = 3.14r2
Solving
251.2 = 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.
251.2 + -3.14r2 = 3.14r2 + -3.14r2
Combine like terms: 3.14r2 + -3.14r2 = 0.00
251.2 + -3.14r2 = 0.00
Add '-251.2' to each side of the equation.
251.2 + -251.2 + -3.14r2 = 0.00 + -251.2
Combine like terms: 251.2 + -251.2 = 0.0
0.0 + -3.14r2 = 0.00 + -251.2
-3.14r2 = 0.00 + -251.2
Combine like terms: 0.00 + -251.2 = -251.2
-3.14r2 = -251.2
Divide each side by '-3.14'.
r2 = 80
Simplifying
r2 = 80
Take the square root of each side:
r = {-8.94427191, 8.94427191}
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