326.6856=4*3.14*r^2

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Solution for 326.6856=4*3.14*r^2 equation: 


Simplifying
326.6856 = 4 * 3.14r2

Multiply 4 * 3.14
326.6856 = 12.56r2

Solving
326.6856 = 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.
326.6856 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
326.6856 + -12.56r2 = 0.00

Add '-326.6856' to each side of the equation.
326.6856 + -326.6856 + -12.56r2 = 0.00 + -326.6856

Combine like terms: 326.6856 + -326.6856 = 0.0000
0.0000 + -12.56r2 = 0.00 + -326.6856
-12.56r2 = 0.00 + -326.6856

Combine like terms: 0.00 + -326.6856 = -326.6856
-12.56r2 = -326.6856

Divide each side by '-12.56'.
r2 = 26.01

Simplifying
r2 = 26.01

Take the square root of each side:
r = {-5.1, 5.1}

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