Question

Two vectors a and b have magnitudes 3 and 7 respectively. Also, a ⋅ b = 21/ 2

Find the angle between a and b. Note: Input in radians​

Answer 1

Answer:

Pi/3 radians

Step-by-step explanation:

Magnitudes of vector a = 3

Magnitude of vector b = 7

We know that cos theta = a.b/ |a| |b|

So,

Cos theta = 21/2×3×7

21/42

Cos theta = 1/2

Theta = 60°

So,

Pi/3 radians