first pic:
A = b h where b = 9 + 3 = 12 and h = 6
so
A = 12 x 6 = 72 square units
Answer: 72 square units
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second pic:
Area of trapezoid A = 1/2(b1 + b2) h
where b1 = 10, b2 = 8 and h = 4
so
A = 1/2(10+8)(4) = 36 square units
Answer: 36 square units