2138.9994=3.14*r^2

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Solution for 2138.9994=3.14*r^2 equation: 


Simplifying
2138.9994 = 3.14r2

Solving
2138.9994 = 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.
2138.9994 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
2138.9994 + -3.14r2 = 0.00

Add '-2138.9994' to each side of the equation.
2138.9994 + -2138.9994 + -3.14r2 = 0.00 + -2138.9994

Combine like terms: 2138.9994 + -2138.9994 = 0.0000
0.0000 + -3.14r2 = 0.00 + -2138.9994
-3.14r2 = 0.00 + -2138.9994

Combine like terms: 0.00 + -2138.9994 = -2138.9994
-3.14r2 = -2138.9994

Divide each side by '-3.14'.
r2 = 681.21

Simplifying
r2 = 681.21

Take the square root of each side:
r = {-26.1, 26.1}

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