9847.04=4*3.14r^2

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Solution for 9847.04=4*3.14r^2 equation: 


Simplifying
9847.04 = 4 * 3.14r2

Multiply 4 * 3.14
9847.04 = 12.56r2

Solving
9847.04 = 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.
9847.04 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
9847.04 + -12.56r2 = 0.00

Add '-9847.04' to each side of the equation.
9847.04 + -9847.04 + -12.56r2 = 0.00 + -9847.04

Combine like terms: 9847.04 + -9847.04 = 0.00
0.00 + -12.56r2 = 0.00 + -9847.04
-12.56r2 = 0.00 + -9847.04

Combine like terms: 0.00 + -9847.04 = -9847.04
-12.56r2 = -9847.04

Divide each side by '-12.56'.
r2 = 784

Simplifying
r2 = 784

Take the square root of each side:
r = {-28, 28}

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