Answer:
45 units
Step-by-step explanation:
Since both figures are similar, the ratio of their similar sides will be equal to a constant. Hence;
8/10 = 12/EH
8EH = 12 * 10
8EH = 120
EH = 120/8
EH = 15
Perimeter of EFGH = 15 + 10 + 5 + 15 = 45 units
