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Simplifying
163.28 = 3.14r2
Solving
163.28 = 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.
163.28 + -3.14r2 = 3.14r2 + -3.14r2
Combine like terms: 3.14r2 + -3.14r2 = 0.00
163.28 + -3.14r2 = 0.00
Add '-163.28' to each side of the equation.
163.28 + -163.28 + -3.14r2 = 0.00 + -163.28
Combine like terms: 163.28 + -163.28 = 0.00
0.00 + -3.14r2 = 0.00 + -163.28
-3.14r2 = 0.00 + -163.28
Combine like terms: 0.00 + -163.28 = -163.28
-3.14r2 = -163.28
Divide each side by '-3.14'.
r2 = 52
Simplifying
r2 = 52
Take the square root of each side:
r = {-7.211102551, 7.211102551}
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