8490.56=4*3.14*r^2

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Solution for 8490.56=4*3.14*r^2 equation: 


Simplifying
8490.56 = 4 * 3.14r2

Multiply 4 * 3.14
8490.56 = 12.56r2

Solving
8490.56 = 12.56r2

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '-12.56r2' to each side of the equation.
8490.56 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
8490.56 + -12.56r2 = 0.00

Add '-8490.56' to each side of the equation.
8490.56 + -8490.56 + -12.56r2 = 0.00 + -8490.56

Combine like terms: 8490.56 + -8490.56 = 0.00
0.00 + -12.56r2 = 0.00 + -8490.56
-12.56r2 = 0.00 + -8490.56

Combine like terms: 0.00 + -8490.56 = -8490.56
-12.56r2 = -8490.56

Divide each side by '-12.56'.
r2 = 676

Simplifying
r2 = 676

Take the square root of each side:
r = {-26, 26}

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