4*3.14r^2=3378.1376

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Solution for 4*3.14r^2=3378.1376 equation: 


Simplifying
4 * 3.14r2 = 3378.1376

Multiply 4 * 3.14
12.56r2 = 3378.1376

Solving
12.56r2 = 3378.1376

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Divide each side by '12.56'.
r2 = 268.96

Simplifying
r2 = 268.96

Take the square root of each side:
r = {-16.4, 16.4}

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