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If `vec x` and `vec y` are two non-collinear vectors and ABC is a triangle with side lengths a,b and c satisfying (20a-15b)`vec x` + (15b-12c)`vec y` + (12c-20a)`vec x xx vec y=0` is:

A

an acute-angled triangle

B

an obtuse-angled triangle

C

a right-angled triangle

D

an isosceles triangle

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The correct Answer is:
D
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