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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?
Solution
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
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