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If A = (-1,6,6), B = (-4,9,6), G=13(5,22,22) and G is the centroid of the Δ​ABC , then the name of the triangle ABC is

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a
an isosceles triangle
b
a right angled triangle
c
an equilateral triangle
d
a right-angled isosceles triangle

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detailed solution

Correct option is D

C = 3G-A-B, AB=18,BC=36,AC=18

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