Question

If B is the midpoint of `overline"AC"` and C is the midpoint of `overline"BD"`, where A, B, C, and D lie on a straight line, say why AB = CD?

Answer 1

Since B is the mid-point of AC,

AB = BC .....(1)

Since C is the mid-point of BD,

BC = CD ....(2)

From equations (1) and (2), we may find that

AB = CD