Name the rays in the given figures.
What is the common point of all these rays?
 

A line through two endpoints $\text{'}\mathrm{A}\text{'}$ and $\text{'}\mathrm{B}\text{'}$ is denoted by ______.

A line segment from point $\text{'}\mathrm{B}\text{'}$ to point $\text{'}\mathrm{A}\text{'}$ is denoted by _____.

A ray has a _____ endpoint$\left(\mathrm{s}\right)$.

How many line segments are there in the given line? Name them.

Construct a line segment using ruler and compass.

$\overline{\mathrm{AB}}=7.5 \mathrm{cm}$

Construct a line segment using ruler and compass.

$\overline{\mathrm{CD}}=3.6 \mathrm{cm}$

Construct a line segment using ruler and compass.

$\overline{\mathrm{QR}}=10 \mathrm{cm}$