Question 6
If B is the mid-point of ¯¯¯¯¯¯¯¯AC and C is the mid-point of ¯¯¯¯¯¯¯¯¯BD, where A, B, C, D lie on a straight line, say why AB = CD?
B is the mid-point of ¯¯¯¯¯¯¯¯AC.
∴AB=BC (i)
And C is the mid-point of ¯¯¯¯¯¯¯¯¯BD
∴BC=CD (ii)
From equation (i) and (ii), we get
AB = CD