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a=10m
b=6m
c=21m
a^2=b^2+e^2
100=36+e^2
e^2=100-36
e^2=64 /pierwiastek
e=8
h=e
b=m
w=c-m
w=21-6
w=15
h^2+w^2=d^2
8^2+15^2=d^2
64+225=d^2
289=d^2 /pierwisatek
d=17
obw= 17+21+6+8=52m
odp:obwód trapezu wynosi 52m
2.