18=3.14r^2

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Solution for 18=3.14r^2 equation: 


Simplifying
18 = 3.14r2

Solving
18 = 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.
18 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
18 + -3.14r2 = 0.00

Add '-18' to each side of the equation.
18 + -18 + -3.14r2 = 0.00 + -18

Combine like terms: 18 + -18 = 0
0 + -3.14r2 = 0.00 + -18
-3.14r2 = 0.00 + -18

Combine like terms: 0.00 + -18 = -18
-3.14r2 = -18

Divide each side by '-3.14'.
r2 = 5.732484076

Simplifying
r2 = 5.732484076

Take the square root of each side:
r = {-2.394260653, 2.394260653}

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