(13/2)^2=r^2

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Solution for (13/2)^2=r^2 equation: 


r in (-oo:+oo)

(13/2)^2 = r^2 // - r^2

(13/2)^2-r^2 = 0

-1*r^2 = -169/4 // : -1

r^2 = 169/4

r^2 = 169/4 // ^ 1/2

abs(r) = 13/2

r = 13/2 or r = -13/2

r in { 13/2, -13/2 }

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