530.66=3.14*r*r

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Solution for 530.66=3.14*r*r equation: 


Simplifying
530.66 = 3.14r * r

Multiply r * r
530.66 = 3.14r2

Solving
530.66 = 3.14r2

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '-3.14r2' to each side of the equation.
530.66 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
530.66 + -3.14r2 = 0.00

Add '-530.66' to each side of the equation.
530.66 + -530.66 + -3.14r2 = 0.00 + -530.66

Combine like terms: 530.66 + -530.66 = 0.00
0.00 + -3.14r2 = 0.00 + -530.66
-3.14r2 = 0.00 + -530.66

Combine like terms: 0.00 + -530.66 = -530.66
-3.14r2 = -530.66

Divide each side by '-3.14'.
r2 = 169

Simplifying
r2 = 169

Take the square root of each side:
r = {-13, 13}

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