[Note: If A, B, C are any three points on a line such AC + CB = AB, then we can be sure that C lies between A and B]

Answer :

There , A, B and C such that C lies between A and B and AB = 9 cm.

AC = 5 cm, CB = 4 cm.

\(\therefore \) AC + CB = 5 cm + 4 cm = 9 cm.

And AB = 9 cm.

Hence, AB = AC + CB Proved.

- Q.1 What is the disadvantage in comparing line segments by mere observation?
- Q.2 Why is it better to use a divider than a ruler, while measuring the length of a line segment?
- Q.4 If A, B, C are three points on a line such that AB = 5 cm, BC = 3 cm and AC = 8 cm, which one of them lies between the other two?
- Q.5 Verify, whether D is the mid point of\(\overline {AG} . \)
- 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?
- Q.7 Draw five triangles and measure their sides. Check in each case, if the sum of the lengths of any two sides is always less than the third side.

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