Răspuns:
a)
AB = 3 cm
BC= 4/3×AB
BC= 4/3×3 cm
BC= 4 cm
AB = DC
BC= AD
b) Nu poate fi construit
c) P ABCD = 12 cm
AD = 2× AB
AD = BC
AB = DC
2× AB + 2×AB+ AB +AB = 12 cm
6 AB = 12 cm
AB= 12 cm :6
AB= 2 cm
DC = AB
DC=2 cm
AD = 2× AB
AD= 2×2 cm
AD= 4 cm
AD= BC = 4 cm
