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Simplifying
5644.9664 = 4 * 3.14r2
Multiply 4 * 3.14
5644.9664 = 12.56r2
Solving
5644.9664 = 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.
5644.9664 + -12.56r2 = 12.56r2 + -12.56r2
Combine like terms: 12.56r2 + -12.56r2 = 0.00
5644.9664 + -12.56r2 = 0.00
Add '-5644.9664' to each side of the equation.
5644.9664 + -5644.9664 + -12.56r2 = 0.00 + -5644.9664
Combine like terms: 5644.9664 + -5644.9664 = 0.0000
0.0000 + -12.56r2 = 0.00 + -5644.9664
-12.56r2 = 0.00 + -5644.9664
Combine like terms: 0.00 + -5644.9664 = -5644.9664
-12.56r2 = -5644.9664
Divide each side by '-12.56'.
r2 = 449.44
Simplifying
r2 = 449.44
Take the square root of each side:
r = {-21.2, 21.2}
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