4392.1064=4*3.14r^2

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Solution for 4392.1064=4*3.14r^2 equation: 


Simplifying
4392.1064 = 4 * 3.14r2

Multiply 4 * 3.14
4392.1064 = 12.56r2

Solving
4392.1064 = 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.
4392.1064 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
4392.1064 + -12.56r2 = 0.00

Add '-4392.1064' to each side of the equation.
4392.1064 + -4392.1064 + -12.56r2 = 0.00 + -4392.1064

Combine like terms: 4392.1064 + -4392.1064 = 0.0000
0.0000 + -12.56r2 = 0.00 + -4392.1064
-12.56r2 = 0.00 + -4392.1064

Combine like terms: 0.00 + -4392.1064 = -4392.1064
-12.56r2 = -4392.1064

Divide each side by '-12.56'.
r2 = 349.69

Simplifying
r2 = 349.69

Take the square root of each side:
r = {-18.7, 18.7}

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