Answer: 8
Step-by-step explanation:
2x4
To determine the coordinates of the midpoints of a line segment, get the average of the both the abscissas and ordinates. In this example, the average of the abscissas is 22 and that of the ordinates is -4. Thus, the midpoint is (22, -4).
For perimeter you add up the two sides so 15 + 21 equals 36