625=3.14159(r^2)

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Solution for 625=3.14159(r^2) equation: 


Simplifying
625 = 3.14159(r2)

Solving
625 = 3.14159r2

Solving for variable 'r'.

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

Add '-3.14159r2' to each side of the equation.
625 + -3.14159r2 = 3.14159r2 + -3.14159r2

Combine like terms: 3.14159r2 + -3.14159r2 = 0.00000
625 + -3.14159r2 = 0.00000

Add '-625' to each side of the equation.
625 + -625 + -3.14159r2 = 0.00000 + -625

Combine like terms: 625 + -625 = 0
0 + -3.14159r2 = 0.00000 + -625
-3.14159r2 = 0.00000 + -625

Combine like terms: 0.00000 + -625 = -625
-3.14159r2 = -625

Divide each side by '-3.14159'.
r2 = 198.9438469

Simplifying
r2 = 198.9438469

Take the square root of each side:
r = {-14.104745545, 14.104745545}

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