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?

Draw the line AD and mark the points A, B, C and D on it.


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Given in the question B is the mid-point of AC and C is the mid-point of BD.


From the above statement we get,


AB = BC…(i) (mid-point: a mid-point divides a line into two equal parts)


BC = CD…(ii) (mid-point)


From the first and second statements we can say that,


AB = CD


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