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Points of Trisection

If B is the m...

Question

If B is the mid point of and C is the mid point of, where A, B, C, D lie on a straight line, say why AB = CD?

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Solution

Since B is the mid-point of AC,

AB = BC (1)

Since C is the mid-point of BD,

BC = CD (2)

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

AB = CD

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