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Simplifying
2916 * 3.14 = 3.14r2 * 36
Multiply 2916 * 3.14
9156.24 = 3.14r2 * 36
Reorder the terms for easier multiplication:
9156.24 = 3.14 * 36r2
Multiply 3.14 * 36
9156.24 = 113.04r2
Solving
9156.24 = 113.04r2
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '-113.04r2' to each side of the equation.
9156.24 + -113.04r2 = 113.04r2 + -113.04r2
Combine like terms: 113.04r2 + -113.04r2 = 0.00
9156.24 + -113.04r2 = 0.00
Add '-9156.24' to each side of the equation.
9156.24 + -9156.24 + -113.04r2 = 0.00 + -9156.24
Combine like terms: 9156.24 + -9156.24 = 0.00
0.00 + -113.04r2 = 0.00 + -9156.24
-113.04r2 = 0.00 + -9156.24
Combine like terms: 0.00 + -9156.24 = -9156.24
-113.04r2 = -9156.24
Divide each side by '-113.04'.
r2 = 81
Simplifying
r2 = 81
Take the square root of each side:
r = {-9, 9}
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