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Simplifying
3378.1376 = 4 * 3.14r2
Multiply 4 * 3.14
3378.1376 = 12.56r2
Solving
3378.1376 = 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.
3378.1376 + -12.56r2 = 12.56r2 + -12.56r2
Combine like terms: 12.56r2 + -12.56r2 = 0.00
3378.1376 + -12.56r2 = 0.00
Add '-3378.1376' to each side of the equation.
3378.1376 + -3378.1376 + -12.56r2 = 0.00 + -3378.1376
Combine like terms: 3378.1376 + -3378.1376 = 0.0000
0.0000 + -12.56r2 = 0.00 + -3378.1376
-12.56r2 = 0.00 + -3378.1376
Combine like terms: 0.00 + -3378.1376 = -3378.1376
-12.56r2 = -3378.1376
Divide each side by '-12.56'.
r2 = 268.96
Simplifying
r2 = 268.96
Take the square root of each side:
r = {-16.4, 16.4}
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