1690.0736=4*3.13r^2

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Solution for 1690.0736=4*3.13r^2 equation: 


Simplifying
1690.0736 = 4 * 3.13r2

Multiply 4 * 3.13
1690.0736 = 12.52r2

Solving
1690.0736 = 12.52r2

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '-12.52r2' to each side of the equation.
1690.0736 + -12.52r2 = 12.52r2 + -12.52r2

Combine like terms: 12.52r2 + -12.52r2 = 0.00
1690.0736 + -12.52r2 = 0.00

Add '-1690.0736' to each side of the equation.
1690.0736 + -1690.0736 + -12.52r2 = 0.00 + -1690.0736

Combine like terms: 1690.0736 + -1690.0736 = 0.0000
0.0000 + -12.52r2 = 0.00 + -1690.0736
-12.52r2 = 0.00 + -1690.0736

Combine like terms: 0.00 + -1690.0736 = -1690.0736
-12.52r2 = -1690.0736

Divide each side by '-12.52'.
r2 = 134.9899042

Simplifying
r2 = 134.9899042

Take the square root of each side:
r = {-11.618515576, 11.618515576}

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