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Pp =a *h / 2 = 1/2 * 5 cm * 12 cm = 1/2 * 60 cm²= 30 cm²
h = 16 cm
V = Pp * h = 30 cm² * 16 cm = 480 cm³
Pp = (a+b) * h / 2 = [(10 dm + 6 dm) * 3 dm] / 2 = (16 dm * 3 dm) / 2 = 48 dm² / 2 = 24 dm²
h = 17 dm
V = Pp * h = 24 dm² * 17 dm = 408 dm³