Explanation:
the formula for the area of such an object is
area = (a + b)/2 × h
a, b are the 2 parallel "baselines" (top and bottom).
h is the perpendicular height
so, we have
120 = (24 + 16)/2 × h = 40/2 × h = 20 × h
h = 120/20 = 6 cm
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