Answer:
432
Step-by-step explanation:
Lets plug it into the formula
b1 should be the horizontal line on the bottom horizontal line and b2 should be the top horizontal line
so we get b1 = 28 and b2 = 20
according to the formula we should add b1 and b2, getting us 48.
divide 48 by 2: we get 24
24 times h, or the hieght, or 18 is 432
so the answer is 432
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