(3.1415*r^2)+(3.1415*r^2)=628

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Solution for (3.1415*r^2)+(3.1415*r^2)=628 equation: 


Simplifying
(3.1415r2) + (3.1415r2) = 628

Combine like terms: (3.1415r2) + (3.1415r2) = 6.283r2
6.283r2 = 628

Solving
6.283r2 = 628

Solving for variable 'r'.

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

Divide each side by '6.283'.
r2 = 99.95225211

Simplifying
r2 = 99.95225211

Take the square root of each side:
r = {-9.99761232, 9.99761232}

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