450=4*3.14*r^2

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Solution for 450=4*3.14*r^2 equation: 


Simplifying
450 = 4 * 3.14r2

Multiply 4 * 3.14
450 = 12.56r2

Solving
450 = 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.
450 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
450 + -12.56r2 = 0.00

Add '-450' to each side of the equation.
450 + -450 + -12.56r2 = 0.00 + -450

Combine like terms: 450 + -450 = 0
0 + -12.56r2 = 0.00 + -450
-12.56r2 = 0.00 + -450

Combine like terms: 0.00 + -450 = -450
-12.56r2 = -450

Divide each side by '-12.56'.
r2 = 35.82802548

Simplifying
r2 = 35.82802548

Take the square root of each side:
r = {-5.985651634, 5.985651634}

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