Question

If i+ j, j+ k, i+ k are position vectors of vertices of triangle ABC taken in order, then ∠ A is equal to:

• A. \(\dfrac{\pi}{2}\)
• B. \(\dfrac{\pi}{5}\)
• C. \(\dfrac{\pi}{6}\)
• D. (π)/(3)

Hint:

Angle between vectors uses dot product.

Answer 1

The Correct Option is D