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Simplifying
10000 = 3.14r2
Solving
10000 = 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.
10000 + -3.14r2 = 3.14r2 + -3.14r2
Combine like terms: 3.14r2 + -3.14r2 = 0.00
10000 + -3.14r2 = 0.00
Add '-10000' to each side of the equation.
10000 + -10000 + -3.14r2 = 0.00 + -10000
Combine like terms: 10000 + -10000 = 0
0 + -3.14r2 = 0.00 + -10000
-3.14r2 = 0.00 + -10000
Combine like terms: 0.00 + -10000 = -10000
-3.14r2 = -10000
Divide each side by '-3.14'.
r2 = 3184.713376
Simplifying
r2 = 3184.713376
Take the square root of each side:
r = {-56.4332648, 56.4332648}
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