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Simplifying
100 = 3.14(r2)
Solving
100 = 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.
100 + -3.14r2 = 3.14r2 + -3.14r2
Combine like terms: 3.14r2 + -3.14r2 = 0.00
100 + -3.14r2 = 0.00
Add '-100' to each side of the equation.
100 + -100 + -3.14r2 = 0.00 + -100
Combine like terms: 100 + -100 = 0
0 + -3.14r2 = 0.00 + -100
-3.14r2 = 0.00 + -100
Combine like terms: 0.00 + -100 = -100
-3.14r2 = -100
Divide each side by '-3.14'.
r2 = 31.84713376
Simplifying
r2 = 31.84713376
Take the square root of each side:
r = {-5.64332648, 5.64332648}
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