# Vectors

Figure 1

1. If two vectors **a** and **b** are placed so that they form the sides of a triangle( Figure 1 ), what is the vector along the third side? Let the vectors point as shown.

###### Answer

**b** - **a**

2. **a** and **b** lie along the sides of a triangle, as shown in Figure 1. What is the median from their common vertex to the opposite side?

###### Answer

( **a** + **b** )/2