NCERT Solutions Class 6 Mathematics Chapter 5 Understanding Elementary Shapes

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Q.1: Take any post card. Use the above technique to measure its two adjacent sides.

Ans : Missing 

Q.2: Select any three objects having a flat top. Measure all sides of the top using a divider and a ruler.

Ans : Missing 

Q.3: What is the disadvantage in comparing line segments by mere observation?

Ans : By mere observation, we cannot be absolutely sure about the judgement. When we compare two line segments of almost same lengths, we cannot be sure about the line segment of greater length. Therefore, it's not an appropriate method to compare line segments having a slight difference between their lengths. This is the disadvantage in comparing line segments bv mere observation. 

Q.4: Why is it better to use a divider than a ruler, while measuring the length of a line segment?

Ans : It is better to use a divider than a ruler because while using a ruler, positioning error may occur due to the incorrect positioning of the eye. 

Q.5: Draw any line segment, say \( \overline { \mathrm { AB } } \). Take any point C lying in between A and B. Measure the lengths of AB, BC and AC. Is AB = AC + CB? 
[Note : If A,B,C are any three points on a line such that AC + CB = AB, then we can be sure that C lies between A and B.]

Ans : It Is given that point C Is lying somewhere in between A and B. Therefore, all these points are lying on the same line segment \( \overline { \mathrm { AB } } \). Hence, for every situation in which point C is lying in between A and B, It may be said that AB = AC + CB.
For example,
\( \overline { \mathrm { AB } } \) is a line segment of 6 cm and C is a point between A and B, such that it is 2 cm away from point B. We can find that the measure of line segment \( \overline { \mathrm { AC } } \) comes to 4 cm.
Hence, relation AB = AC + CB is verified. 

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