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A triangle has a vertex at (1, 2) and the mid points of the two sides through it are (–1, 1) and (2, 3). Then the centroid of this triangle is :

1. ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ 2 , 3 1
2. ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ 3 5 , 3 1
3. ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ 3 7 , 1
4. ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ 1 , 3 1

Correct answer: ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ 2 , 3 1

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