16/361=r^2

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Solution for 16/361=r^2 equation: 


r in (-oo:+oo)

16/361 = r^2 // - r^2

16/361-r^2 = 0

-1*r^2 = -16/361 // : -1

r^2 = 16/361

r^2 = 16/361 // ^ 1/2

abs(r) = 4/19

r = 4/19 or r = -4/19

r in { 4/19, -4/19 }

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