706.5=4*3.14*r*r

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Solution for 706.5=4*3.14*r*r equation: 


Simplifying
706.5 = 4 * 3.14r * r

Multiply 4 * 3.14
706.5 = 12.56r * r

Multiply r * r
706.5 = 12.56r2

Solving
706.5 = 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.
706.5 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
706.5 + -12.56r2 = 0.00

Add '-706.5' to each side of the equation.
706.5 + -706.5 + -12.56r2 = 0.00 + -706.5

Combine like terms: 706.5 + -706.5 = 0.0
0.0 + -12.56r2 = 0.00 + -706.5
-12.56r2 = 0.00 + -706.5

Combine like terms: 0.00 + -706.5 = -706.5
-12.56r2 = -706.5

Divide each side by '-12.56'.
r2 = 56.25

Simplifying
r2 = 56.25

Take the square root of each side:
r = {-7.5, 7.5}

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