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Simplifying
4 = 3.14r2
Solving
4 = 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.
4 + -3.14r2 = 3.14r2 + -3.14r2
Combine like terms: 3.14r2 + -3.14r2 = 0.00
4 + -3.14r2 = 0.00
Add '-4' to each side of the equation.
4 + -4 + -3.14r2 = 0.00 + -4
Combine like terms: 4 + -4 = 0
0 + -3.14r2 = 0.00 + -4
-3.14r2 = 0.00 + -4
Combine like terms: 0.00 + -4 = -4
-3.14r2 = -4
Divide each side by '-3.14'.
r2 = 1.27388535
Simplifying
r2 = 1.27388535
Take the square root of each side:
r = {-1.128665296, 1.128665296}
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