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Simplifying
81.6714 = 3.14r2
Solving
81.6714 = 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.
81.6714 + -3.14r2 = 3.14r2 + -3.14r2
Combine like terms: 3.14r2 + -3.14r2 = 0.00
81.6714 + -3.14r2 = 0.00
Add '-81.6714' to each side of the equation.
81.6714 + -81.6714 + -3.14r2 = 0.00 + -81.6714
Combine like terms: 81.6714 + -81.6714 = 0.0000
0.0000 + -3.14r2 = 0.00 + -81.6714
-3.14r2 = 0.00 + -81.6714
Combine like terms: 0.00 + -81.6714 = -81.6714
-3.14r2 = -81.6714
Divide each side by '-3.14'.
r2 = 26.01
Simplifying
r2 = 26.01
Take the square root of each side:
r = {-5.1, 5.1}
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