Question
Mathematics Question on Triangles
Let A(3, 0, - 1) , B(2, 10, 6) and C(1, 2, 1) be the vertices of a triangle and M be the mid-point of AC. If G divides BM in the ratio 2:1, then cos( ∠GOA ) (O being the origin) is equal to______.
A
1/√15
B
1/2√15
C
1/√30
D
1/6√10
Answer
1/√15
Explanation
Solution
The correct answer is(A): 1/√15