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5,8-podstawa
5,8-1,4=4,4 - pierwsze ramie
13,14-4,4-5,8=2,94 drugie ramie:P
a- 5,8m
b- 5,8m-1,6m=4,2m
5,8m+4,2m=10m
13,14m-10m=3,14m
3,14m:2=1,57m
Odp.Długość ramienia tego trapezu wynosi 1,57m.
;p
3, 14: 2 = 1,57