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a) Vì AC =5 cm > BC = 3 cm nên B nằm giữa A và C
Ta có :
AC = AB + BC
5 = AB + 3
=> AB = 5 -3 = 2 cm
b) Vì BC = 3 cm < BD = 6 cm nên C nằm giữa hai điểm B và D
Ta có : BC=CD=\(\frac{BD}{2}\)= \(\frac{6}{2}\)= 3 cm .
C là trung điểm của BD vì BC=CD=3cm và C nằm giữa B và D .