📐 Mathematics · Introduction to Three Dimensional Geometry · JEE

If A(3, 2, 0), B(5, 3, 2) and C(−9, 6, −3) are the vertices of a triangle, the midpoint of BC is:

Answer: (−2, 9/2, −1/2).

Correct answer: B. (−2, 9/2, −1/2)

Explanation: Average B and C: ((5−9)/2, (3+6)/2, (2−3)/2) = (−2, 9/2, −1/2).

Concept context

Coordinate axes and planes in space, octants, distance between two points, and the section formula