1.
Let R⃗=A⃗+B⃗+C⃗\vec{R} = \vec{A} + \vec{B} + \vec{C} and ∣R⃗∣=∣A⃗∣=∣B⃗∣=∣C⃗∣|\vec{R}| = |\vec{A}| = |\vec{B}| = |\vec{C}|. Then which of the following is incorrect?

Note: More than one option may be correct.