28.26=4*3.14*r^2

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Solution for 28.26=4*3.14*r^2 equation: 


Simplifying
28.26 = 4 * 3.14r2

Multiply 4 * 3.14
28.26 = 12.56r2

Solving
28.26 = 12.56r2

Solving for variable 'r'.

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

Add '-12.56r2' to each side of the equation.
28.26 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
28.26 + -12.56r2 = 0.00

Add '-28.26' to each side of the equation.
28.26 + -28.26 + -12.56r2 = 0.00 + -28.26

Combine like terms: 28.26 + -28.26 = 0.00
0.00 + -12.56r2 = 0.00 + -28.26
-12.56r2 = 0.00 + -28.26

Combine like terms: 0.00 + -28.26 = -28.26
-12.56r2 = -28.26

Divide each side by '-12.56'.
r2 = 2.25

Simplifying
r2 = 2.25

Take the square root of each side:
r = {-1.5, 1.5}

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