A = l*w
A = 72* 56
A= 4032
4032 = L*21
4032/21 =L
L =192
Answer:
264 cm^2.
Step-by-step explanation:
The area = 1/2 * height * sum of the parallel sides
= 1/2 * 12 * (28 + 16)
= 6 * 44
= 264 cm^2.
t = 300
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