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P=kreska ułamkowa i w liczniku 30+1/5 w mianowniku 2 to wszystko *10
wynik=2 i 2/3
b-30m-⅕*30m=30m-6m=24m-krótsza podstawa
h=10m
P=(a+b):2*h
P=(30m+24m):2*10m
P=54m:2*10m
P=27m*10m
P=270m²
odp.pole trapezu wynosi 270m²