Răspuns :
BD=DC = 5 cm
BC = 5cm +5cm =10 cm
AB+AC+BC = 46 cm
AB+ AB = 46 cm - 10cm
2AB = 36 cm
AB =36 :2 cm =18 cm
AB=AC = 18 cm
BC = 5cm +5cm =10 cm
AB+AC+BC = 46 cm
AB+ AB = 46 cm - 10cm
2AB = 36 cm
AB =36 :2 cm =18 cm
AB=AC = 18 cm