1690.0736=4*3.14*r^2

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Solution for 1690.0736=4*3.14*r^2 equation: 


Simplifying
1690.0736 = 4 * 3.14r2

Multiply 4 * 3.14
1690.0736 = 12.56r2

Solving
1690.0736 = 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.
1690.0736 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
1690.0736 + -12.56r2 = 0.00

Add '-1690.0736' to each side of the equation.
1690.0736 + -1690.0736 + -12.56r2 = 0.00 + -1690.0736

Combine like terms: 1690.0736 + -1690.0736 = 0.0000
0.0000 + -12.56r2 = 0.00 + -1690.0736
-12.56r2 = 0.00 + -1690.0736

Combine like terms: 0.00 + -1690.0736 = -1690.0736
-12.56r2 = -1690.0736

Divide each side by '-12.56'.
r2 = 134.56

Simplifying
r2 = 134.56

Take the square root of each side:
r = {-11.6, 11.6}

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