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Simplifying
450 = 3.14r2 * 9
Reorder the terms for easier multiplication:
450 = 3.14 * 9r2
Multiply 3.14 * 9
450 = 28.26r2
Solving
450 = 28.26r2
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '-28.26r2' to each side of the equation.
450 + -28.26r2 = 28.26r2 + -28.26r2
Combine like terms: 28.26r2 + -28.26r2 = 0.00
450 + -28.26r2 = 0.00
Add '-450' to each side of the equation.
450 + -450 + -28.26r2 = 0.00 + -450
Combine like terms: 450 + -450 = 0
0 + -28.26r2 = 0.00 + -450
-28.26r2 = 0.00 + -450
Combine like terms: 0.00 + -450 = -450
-28.26r2 = -450
Divide each side by '-28.26'.
r2 = 15.92356688
Simplifying
r2 = 15.92356688
Take the square root of each side:
r = {-3.990434422, 3.990434422}
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