18.84=3.14*r^2

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Solution for 18.84=3.14*r^2 equation: 


Simplifying
18.84 = 3.14r2

Solving
18.84 = 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.
18.84 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
18.84 + -3.14r2 = 0.00

Add '-18.84' to each side of the equation.
18.84 + -18.84 + -3.14r2 = 0.00 + -18.84

Combine like terms: 18.84 + -18.84 = 0.00
0.00 + -3.14r2 = 0.00 + -18.84
-3.14r2 = 0.00 + -18.84

Combine like terms: 0.00 + -18.84 = -18.84
-3.14r2 = -18.84

Divide each side by '-3.14'.
r2 = 6

Simplifying
r2 = 6

Take the square root of each side:
r = {-2.449489743, 2.449489743}

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