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Simplifying
1384.74 = r2 * 3.14
Reorder the terms for easier multiplication:
1384.74 = 3.14r2
Solving
1384.74 = 3.14r2
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '-3.14r2' to each side of the equation.
1384.74 + -3.14r2 = 3.14r2 + -3.14r2
Combine like terms: 3.14r2 + -3.14r2 = 0.00
1384.74 + -3.14r2 = 0.00
Add '-1384.74' to each side of the equation.
1384.74 + -1384.74 + -3.14r2 = 0.00 + -1384.74
Combine like terms: 1384.74 + -1384.74 = 0.00
0.00 + -3.14r2 = 0.00 + -1384.74
-3.14r2 = 0.00 + -1384.74
Combine like terms: 0.00 + -1384.74 = -1384.74
-3.14r2 = -1384.74
Divide each side by '-3.14'.
r2 = 441
Simplifying
r2 = 441
Take the square root of each side:
r = {-21, 21}
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