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Simplifying
181.2408 = 4 * 3.14r2
Multiply 4 * 3.14
181.2408 = 12.56r2
Solving
181.2408 = 12.56r2
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '-12.56r2' to each side of the equation.
181.2408 + -12.56r2 = 12.56r2 + -12.56r2
Combine like terms: 12.56r2 + -12.56r2 = 0.00
181.2408 + -12.56r2 = 0.00
Add '-181.2408' to each side of the equation.
181.2408 + -181.2408 + -12.56r2 = 0.00 + -181.2408
Combine like terms: 181.2408 + -181.2408 = 0.0000
0.0000 + -12.56r2 = 0.00 + -181.2408
-12.56r2 = 0.00 + -181.2408
Combine like terms: 0.00 + -181.2408 = -181.2408
-12.56r2 = -181.2408
Divide each side by '-12.56'.
r2 = 14.43
Simplifying
r2 = 14.43
Take the square root of each side:
r = {-3.798683983, 3.798683983}
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