9198=4*3.14*r^2

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Solution for 9198=4*3.14*r^2 equation: 


Simplifying
9198 = 4 * 3.14r2

Multiply 4 * 3.14
9198 = 12.56r2

Solving
9198 = 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.
9198 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
9198 + -12.56r2 = 0.00

Add '-9198' to each side of the equation.
9198 + -9198 + -12.56r2 = 0.00 + -9198

Combine like terms: 9198 + -9198 = 0
0 + -12.56r2 = 0.00 + -9198
-12.56r2 = 0.00 + -9198

Combine like terms: 0.00 + -9198 = -9198
-12.56r2 = -9198

Divide each side by '-12.56'.
r2 = 732.3248408

Simplifying
r2 = 732.3248408

Take the square root of each side:
r = {-27.061501082, 27.061501082}

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