Answer:
Step-by-step explanation:
We can use to formula of finding the area of a trapezoid in this problem.
Formula: [(b1 + b2)/2] *h, where b1 and b2 are the bases and h is the height.
b1 can be the bottom base, which has a length of 21 units.
b2 can be the top base, which has a length of (21-9-3)+3 = 12 units.
h has a length of 8, since it is the height.
Plugging these into the formula, we can see that the area of the entire figure is (21+12)/2 * 8 = 33/2 * 8 = 33*4 = 132 units².
Hope this helps! :)
