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Simplifying
1331 = 3.14(r2)
Solving
1331 = 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.
1331 + -3.14r2 = 3.14r2 + -3.14r2
Combine like terms: 3.14r2 + -3.14r2 = 0.00
1331 + -3.14r2 = 0.00
Add '-1331' to each side of the equation.
1331 + -1331 + -3.14r2 = 0.00 + -1331
Combine like terms: 1331 + -1331 = 0
0 + -3.14r2 = 0.00 + -1331
-3.14r2 = 0.00 + -1331
Combine like terms: 0.00 + -1331 = -1331
-3.14r2 = -1331
Divide each side by '-3.14'.
r2 = 423.8853503
Simplifying
r2 = 423.8853503
Take the square root of each side:
r = {-20.588476153, 20.588476153}
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