75.3914=3.14*r^2

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Solution for 75.3914=3.14*r^2 equation: 


Simplifying
75.3914 = 3.14r2

Solving
75.3914 = 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.
75.3914 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
75.3914 + -3.14r2 = 0.00

Add '-75.3914' to each side of the equation.
75.3914 + -75.3914 + -3.14r2 = 0.00 + -75.3914

Combine like terms: 75.3914 + -75.3914 = 0.0000
0.0000 + -3.14r2 = 0.00 + -75.3914
-3.14r2 = 0.00 + -75.3914

Combine like terms: 0.00 + -75.3914 = -75.3914
-3.14r2 = -75.3914

Divide each side by '-3.14'.
r2 = 24.01

Simplifying
r2 = 24.01

Take the square root of each side:
r = {-4.9, 4.9}

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