66.4424=3.14r^2

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Solution for 66.4424=3.14r^2 equation: 


Simplifying
66.4424 = 3.14r2

Solving
66.4424 = 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.
66.4424 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
66.4424 + -3.14r2 = 0.00

Add '-66.4424' to each side of the equation.
66.4424 + -66.4424 + -3.14r2 = 0.00 + -66.4424

Combine like terms: 66.4424 + -66.4424 = 0.0000
0.0000 + -3.14r2 = 0.00 + -66.4424
-3.14r2 = 0.00 + -66.4424

Combine like terms: 0.00 + -66.4424 = -66.4424
-3.14r2 = -66.4424

Divide each side by '-3.14'.
r2 = 21.16

Simplifying
r2 = 21.16

Take the square root of each side:
r = {-4.6, 4.6}

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