1748.8544=4*3.14*r^2

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Solution for 1748.8544=4*3.14*r^2 equation: 


Simplifying
1748.8544 = 4 * 3.14r2

Multiply 4 * 3.14
1748.8544 = 12.56r2

Solving
1748.8544 = 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.
1748.8544 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
1748.8544 + -12.56r2 = 0.00

Add '-1748.8544' to each side of the equation.
1748.8544 + -1748.8544 + -12.56r2 = 0.00 + -1748.8544

Combine like terms: 1748.8544 + -1748.8544 = 0.0000
0.0000 + -12.56r2 = 0.00 + -1748.8544
-12.56r2 = 0.00 + -1748.8544

Combine like terms: 0.00 + -1748.8544 = -1748.8544
-12.56r2 = -1748.8544

Divide each side by '-12.56'.
r2 = 139.24

Simplifying
r2 = 139.24

Take the square root of each side:
r = {-11.8, 11.8}

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