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Simplifying
36 = 3.14r * r
Multiply r * r
36 = 3.14r2
Solving
36 = 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.
36 + -3.14r2 = 3.14r2 + -3.14r2
Combine like terms: 3.14r2 + -3.14r2 = 0.00
36 + -3.14r2 = 0.00
Add '-36' to each side of the equation.
36 + -36 + -3.14r2 = 0.00 + -36
Combine like terms: 36 + -36 = 0
0 + -3.14r2 = 0.00 + -36
-3.14r2 = 0.00 + -36
Combine like terms: 0.00 + -36 = -36
-3.14r2 = -36
Divide each side by '-3.14'.
r2 = 11.46496815
Simplifying
r2 = 11.46496815
Take the square root of each side:
r = {-3.385995887, 3.385995887}
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