#### Answer

To sketch the vector $a+b$, we can sketch the vector $a$ and the vector $b$ so that their initial points coincide. Then we can complete the parallelogram. The resultant vector through the middle of the parallelogram is the vector $a+b$.

#### Work Step by Step

To sketch the vector $a+b$, we can sketch the vector $a$ and the vector $b$ so that their initial points coincide. Then we can use another copy of the vector $a$ and the vector $b$ to complete the parallelogram. The resultant vector through the middle of the parallelogram is the vector $a+b$.