379.94=3.14(r*r)

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Solution for 379.94=3.14(r*r) equation: 


Simplifying
379.94 = 3.14(r * r)

Multiply r * r
379.94 = 3.14(r2)

Solving
379.94 = 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.
379.94 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
379.94 + -3.14r2 = 0.00

Add '-379.94' to each side of the equation.
379.94 + -379.94 + -3.14r2 = 0.00 + -379.94

Combine like terms: 379.94 + -379.94 = 0.00
0.00 + -3.14r2 = 0.00 + -379.94
-3.14r2 = 0.00 + -379.94

Combine like terms: 0.00 + -379.94 = -379.94
-3.14r2 = -379.94

Divide each side by '-3.14'.
r2 = 121

Simplifying
r2 = 121

Take the square root of each side:
r = {-11, 11}

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