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JEE Main 2019 Mathematics question

MathematicsThree Dimensional GeometryJEE Main 2019

Let A(3, 0, −1), B(2, 10, 6) and C(1, 2, 1) be the vertices of a triangle and M be the midpoint of AC. If G divides BM in the ratio, 2 : 1, then cos(∠GOA) (O being the origin) is equal to:

Answer: (A)

Solution

G is the centroid (2, 4, 2); .

Question ID VK-009919