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b=2,5cm
h=0,8*7,5
h=6
P=(a+b)h/2=(7,5+2,5)*6/2=30 cm²
b - krótsza podstawa = 2½ cm = 2,5 cm
h - wysokość = 0,8a = 0,8 razy 7,5 = 6 cm
P - pole powierzchni = (a + b)h/2 = (7,5 + 2,5)6/2 = 60/2 = 30 cm²