31.4=3.14*r^2

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Solution for 31.4=3.14*r^2 equation: 


Simplifying
31.4 = 3.14r2

Solving
31.4 = 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.
31.4 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
31.4 + -3.14r2 = 0.00

Add '-31.4' to each side of the equation.
31.4 + -31.4 + -3.14r2 = 0.00 + -31.4

Combine like terms: 31.4 + -31.4 = 0.0
0.0 + -3.14r2 = 0.00 + -31.4
-3.14r2 = 0.00 + -31.4

Combine like terms: 0.00 + -31.4 = -31.4
-3.14r2 = -31.4

Divide each side by '-3.14'.
r2 = 10

Simplifying
r2 = 10

Take the square root of each side:
r = {-3.16227766, 3.16227766}

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