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Simplifying
84.905 = 3.14r2
Solving
84.905 = 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.
84.905 + -3.14r2 = 3.14r2 + -3.14r2
Combine like terms: 3.14r2 + -3.14r2 = 0.00
84.905 + -3.14r2 = 0.00
Add '-84.905' to each side of the equation.
84.905 + -84.905 + -3.14r2 = 0.00 + -84.905
Combine like terms: 84.905 + -84.905 = 0.000
0.000 + -3.14r2 = 0.00 + -84.905
-3.14r2 = 0.00 + -84.905
Combine like terms: 0.00 + -84.905 = -84.905
-3.14r2 = -84.905
Divide each side by '-3.14'.
r2 = 27.03980892
Simplifying
r2 = 27.03980892
Take the square root of each side:
r = {-5.199981627, 5.199981627}
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