408.0744=4*3.14r^2

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Solution for 408.0744=4*3.14r^2 equation: 


Simplifying
408.0744 = 4 * 3.14r2

Multiply 4 * 3.14
408.0744 = 12.56r2

Solving
408.0744 = 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.
408.0744 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
408.0744 + -12.56r2 = 0.00

Add '-408.0744' to each side of the equation.
408.0744 + -408.0744 + -12.56r2 = 0.00 + -408.0744

Combine like terms: 408.0744 + -408.0744 = 0.0000
0.0000 + -12.56r2 = 0.00 + -408.0744
-12.56r2 = 0.00 + -408.0744

Combine like terms: 0.00 + -408.0744 = -408.0744
-12.56r2 = -408.0744

Divide each side by '-12.56'.
r2 = 32.49

Simplifying
r2 = 32.49

Take the square root of each side:
r = {-5.7, 5.7}

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