804=4(3.14)r^2

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Solution for 804=4(3.14)r^2 equation: 


Simplifying
804 = 4(3.14) * r2

Multiply 4 * 3.14
804 = 12.56r2

Solving
804 = 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.
804 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
804 + -12.56r2 = 0.00

Add '-804' to each side of the equation.
804 + -804 + -12.56r2 = 0.00 + -804

Combine like terms: 804 + -804 = 0
0 + -12.56r2 = 0.00 + -804
-12.56r2 = 0.00 + -804

Combine like terms: 0.00 + -804 = -804
-12.56r2 = -804

Divide each side by '-12.56'.
r2 = 64.01273885

Simplifying
r2 = 64.01273885

Take the square root of each side:
r = {-8.000796139, 8.000796139}

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