1.

If origin is the centroid of a triangle, whose vertices are (3, 2), (-6, y) and (3,-2), then y = …………………. A) 0 B) 3 C) 2 D) 6

Answer»

Correct option is (A) 0

Vertices of triangle are (3, 2), (-6, y) and (3,-2).

\(\therefore\) Centroid of triangle \(=\left(\frac{3+(-6)+3}3,\frac{2+y+(-2)}3\right)\)

\(=(0,\frac y3)\)

But given that centroid of triangle is origin (0, 0).

\(\therefore\) \((0,\frac y3)=(0,0)\)

\(\Rightarrow\frac y3=0\)       (By comparing y-coordinate)

\(\Rightarrow y=0\)

Correct option is A) 0



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