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After measuring their sides we have found that the sum of lengths of any two sides of a triangle is always greater than the third side.
To Prove B is the mid point of AC              C is the mid point of BD              From (i) and (ii) we can conclude  Hence proved.
AD = 4 - 1 = 3 DG = 7 - 4 = 3 Therefore AD = DG Therefore D is the midpoint of AG.
AB = 5 cm BC = 3 cm AC = 8 cm Therefore AB + BC = AC Therefore point B lies between points A and C.
While measuring the length of a line segment using error might creep in due to the thickness and translucency of the ruler and because of angular viewing. We can get rid of these errors using a divider.

1.  What is the disadvantage in comparing line segments by mere observation?