Răspuns:
Explicație pas cu pas:
notam DE=FG=a si DG=EF=b
a)a+b=P/2=100/2=50 cm
a=2/3b 2b/3+b=50 2b+3b=150 5b=150 b=30 cm
a=2×30/3=20 cm
b)b=3a/7 a+3a/7=50 7a+3a=350 10a=350 a=35 cm
b=3×35/7=3×5=15 cm
