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PΔ=63m²
ramie c=a-5cm=18-5=13m
P=1/2*a*h
63=1/2*18*h
63=9h /:9
h=7m--->wysokosc opusczona na podstawe
obwod O=a+2c=18+2·13=18+26=44 m
18-5=13cm ramię
63m2=(18*h)/2
126m2=18*h
h=126/18
h=7cm
obw= 18+13*2=44cm
liczę na naj ;)