In the following figures, the figure that is not symmetric with respect to any line is:

The number of lines of symmetry in a $30°-60°-90°$ set-square is _____. [$3/1/0$]

A regular octagon has $10$ lines of symmetry.

The digits having only two lines of symmetry are $0$ and _____.

The number of lines of symmetry in the given figure is ____________ .

If a line segment of length $5 \mathrm{cm}$ is reflected in a line of symmetry (mirror), then its reflection (image) is a line segment of length _____ $\mathrm{cm}$.

In the word $\mathrm{ALGEBRA}$, $\mathrm{L}$ and $\mathrm{G}$ have no line of symmetry. Find the third letter with no line of symmetry in it.