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h1=4cm
h2=3cm
P=36cm2
Rozwiązanie:
a=36cm2:4
a=9cm
b=36cm2:3cm
b=13cm
Ob=2*9+2*13
Ob=18+26
Ob=44cm
zad2
Ob=52cm
a=52cm:4=13cm
h1=13-3=10cm
h2=10+11=21cm
P=1/2*h1*h2
P=1/2*10*21=1/2*210=105cm2