2138.9934=3.14*r^2

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Solution for 2138.9934=3.14*r^2 equation: 


Simplifying
2138.9934 = 3.14r2

Solving
2138.9934 = 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.
2138.9934 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
2138.9934 + -3.14r2 = 0.00

Add '-2138.9934' to each side of the equation.
2138.9934 + -2138.9934 + -3.14r2 = 0.00 + -2138.9934

Combine like terms: 2138.9934 + -2138.9934 = 0.0000
0.0000 + -3.14r2 = 0.00 + -2138.9934
-3.14r2 = 0.00 + -2138.9934

Combine like terms: 0.00 + -2138.9934 = -2138.9934
-3.14r2 = -2138.9934

Divide each side by '-3.14'.
r2 = 681.2080892

Simplifying
r2 = 681.2080892

Take the square root of each side:
r = {-26.099963395, 26.099963395}

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