Question

the two vectors $\vec{A}$ and $\vec{B}$ are drawn from a common point and $\vec{C}=\vec{A}+\vec{B}$

• A. If C2=A2+B2, the angle between vector A and B is 90$^{\circ}$
• B. If C2 <A2+B2, the angle between vector A and B is greater than 90$^{\circ}$
• C. If C2 >A2+B2, the angle between vector A and B is between 0$^{\circ}$and 90$^{\circ}$
• D. If C=A-B, angle between the vectors A and B is 180$^{\circ}$

Answer 1

Answer: (D)

If C=A-B, angle between the vectors A and B is 180$^{\circ}$

Answer 2

Two vectors are drawn from a common point so the equation can be solved by-