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# Q.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?

Guven B is the mid point of AC .
$$\therefore$$ AB = BC …(i)
Given, C is the mid-point of BD .
BC = CD .... (ii)
From Eq.(i) and (ii), We have
AB = CD