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Simplifying
66 = 3.14r2(3.3)
Reorder the terms for easier multiplication:
66 = 3.14 * 3.3r2
Multiply 3.14 * 3.3
66 = 10.362r2
Solving
66 = 10.362r2
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '-10.362r2' to each side of the equation.
66 + -10.362r2 = 10.362r2 + -10.362r2
Combine like terms: 10.362r2 + -10.362r2 = 0.000
66 + -10.362r2 = 0.000
Add '-66' to each side of the equation.
66 + -66 + -10.362r2 = 0.000 + -66
Combine like terms: 66 + -66 = 0
0 + -10.362r2 = 0.000 + -66
-10.362r2 = 0.000 + -66
Combine like terms: 0.000 + -66 = -66
-10.362r2 = -66
Divide each side by '-10.362'.
r2 = 6.369426752
Simplifying
r2 = 6.369426752
Take the square root of each side:
r = {-2.523772326, 2.523772326}
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