28.28=3.14r^2

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Solution for 28.28=3.14r^2 equation: 


Simplifying
28.28 = 3.14r2

Solving
28.28 = 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.
28.28 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
28.28 + -3.14r2 = 0.00

Add '-28.28' to each side of the equation.
28.28 + -28.28 + -3.14r2 = 0.00 + -28.28

Combine like terms: 28.28 + -28.28 = 0.00
0.00 + -3.14r2 = 0.00 + -28.28
-3.14r2 = 0.00 + -28.28

Combine like terms: 0.00 + -28.28 = -28.28
-3.14r2 = -28.28

Divide each side by '-3.14'.
r2 = 9.006369427

Simplifying
r2 = 9.006369427

Take the square root of each side:
r = {-3.001061383, 3.001061383}

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