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1/2(6,4 + 3,8)*8=
1/2 *10,2*8= 40,8 (sie skróci 2 z 8)
odp.; pole trapezu wynosi 40,8 cm kwadratowych
a=3,8cm
b=6,4cm
h=8 cm
P=(3,8+6,4):2*8
P=10,2:2*8
P=5,1*8
P=40,8 cm²