Given that P=Q=R. if `vecP+vecQ=vecR` then the angle between `vecP & vecR` is `theta_(1)` then the angle between `vecP & vecR` is `theta_(2)`. What is the relation between `theta_(1)` and `theta_(2)`.

Options

A. `theta_(1)=theta_(2)`
B. `theta_(1)=(theta_(1))/(2)`
C. `theta_(1)=2theta_(2)`
D. none of the above

Answer

B

Explanation

P=Q=R and `vecP+vecQ=vecR`
`theta_(1)=60^(@)`
If `P=Q=R` and `vecP+vecQ+vecR=0`
`theta_(2)=120^(@)`