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Simplifying
379.94 = 3.14r2
Solving
379.94 = 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.
379.94 + -3.14r2 = 3.14r2 + -3.14r2
Combine like terms: 3.14r2 + -3.14r2 = 0.00
379.94 + -3.14r2 = 0.00
Add '-379.94' to each side of the equation.
379.94 + -379.94 + -3.14r2 = 0.00 + -379.94
Combine like terms: 379.94 + -379.94 = 0.00
0.00 + -3.14r2 = 0.00 + -379.94
-3.14r2 = 0.00 + -379.94
Combine like terms: 0.00 + -379.94 = -379.94
-3.14r2 = -379.94
Divide each side by '-3.14'.
r2 = 121
Simplifying
r2 = 121
Take the square root of each side:
r = {-11, 11}
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