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16:2=8
8²+6²=x²
64+36=x²
x²=100
x=10
obw=20+4+10+10=44
b=20cm
h=6cm
P=4cm+20cm*6cm/2
P=24cm*6cm/2
P=144cm/2
P=72cm
Ob=a+b+c+d
Ob=4cm+20cm+6cm+16cm
Ob=46cm2
Odpowiedz:obwód trapezu wynosi 46cm2