Measuring line segments

What is the use of a tracing method? What are the Disadvantages of Comparison of Line Segments by Tracing.

Explain positional error due to use of a ruler and divider. If the ruler is placed on a line segment and observed starting point at $4 \mathrm{cm}$ and $12 \mathrm{cm}$ instead of $4.2 \mathrm{cm}$ and $11.8 \mathrm{cm}$. Find the original length of line segment.

What are the Disadvantages of Comparison of Line Segments by Tracing.

Why ruler is not a better instrument, while measuring the length of a line segment?

Explain positional error due to use of a ruler and divider. If the ruler is placed on a line segment and observed starting point at $3 \mathrm{cm}$ and $12 \mathrm{cm}$ instead of $3.1 \mathrm{cm}$ and $11.9 \mathrm{cm}$. Find the original length of line segment.

Explain positional error due to use of a ruler and divider. If the ruler is placed on a line segment and observed starting point at $2 \mathrm{cm}$ and $15 \mathrm{cm}$ instead of $2.3 \mathrm{cm}$ and $14.7 \mathrm{cm}$. Find the original length of line segment.

What possible errors one can make while using a ruler?

What are the ways of comparing a line segment?

There is a line on which the points G, H and I lie such that H is in between G and I.

 If $GH$ = 31 and $HI$ = 11, then find $GI$.

Find which line segment is greater without using ruler?

How to find the bigger line segment in the following figure:

Fill the blank space by finding the length. The line $PS$, whose length is $6 cm$ is divided into $3$ equal parts. 

$\overline{PQ}+\overline{QR}=$ _____ $\mathrm{cm}$

When we measure a length by using ruler, the eye should be positioned just vertically above the mark.

When we measure a length by using the divider, ensure that the one end point of the divider should be at the _____ mark of the ruler.

Which of the statement is wrong in following set of statements.

The _____ of the ruler may cause difficulties in reading off the marks on it. 

Which of the following method is most unsuitable for measuring the length $7.3 \mathrm{cm}$.

Use the ruler with larger thickness for measuring the length of a straight line segment to get the exact measurement without errors.

A cube is a special type of cuboid.

Football is an example of _____ geometrical shape. (Sphere/Circle)