Exercise 34 Page 81

Let's start by plotting the points on a coordinate plane. We can see four sides, so this is a quadrilateral.

This quadrilateral appears to be a trapezoid, but we cannot assume this while we are calculating the perimeter. Recall that the perimeter is the sum of the length of the sides. Since $\overline{AB}$ is horizontal, we can find the distance between $A$ and $B$ by counting squares.