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Simplifying
28.26 = 3.14r2
Solving
28.26 = 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.
28.26 + -3.14r2 = 3.14r2 + -3.14r2
Combine like terms: 3.14r2 + -3.14r2 = 0.00
28.26 + -3.14r2 = 0.00
Add '-28.26' to each side of the equation.
28.26 + -28.26 + -3.14r2 = 0.00 + -28.26
Combine like terms: 28.26 + -28.26 = 0.00
0.00 + -3.14r2 = 0.00 + -28.26
-3.14r2 = 0.00 + -28.26
Combine like terms: 0.00 + -28.26 = -28.26
-3.14r2 = -28.26
Divide each side by '-3.14'.
r2 = 9
Simplifying
r2 = 9
Take the square root of each side:
r = {-3, 3}
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