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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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