Amongst the given figures,
A Rectangle has 2 lines of symmetry.

A Square has 4 lines of symmetry.

An Equilateral triangle has 3 lines of symmetry.

A Regular pentagon has 5 lines of symmetry.

A figure is said to have a line symmetry when we can fold a picture in half such that the right and left halves match exactly or the two halves are mirror images of each other.

The obtained figure would be symmetric as the two halves would be mirror images of each other.

All the figures other than the alphabet B have more than two lines of symmetry.
A square has 4 lines of symmetry.
An equilateral triangle has 3 lines of symmetry.
A star fish has 5 lines of symmetry.
The alphabet B has only 1 line of symmetry.

A line of symmetry is an imaginary line that cuts a shape exactly in half.
The given figure has only one such line.
Thus, it has only one line of symmetry.

The above figure has only one line of symmetry.

By two lines of symmetry we mean that two different lines in the figure can be drawn with respect to which the halves are mirror images of each other.
Eg. Rectangle, the alphabet 'X' etc.

It is clear from the above figure that a regular hexagon has six lines of symmetry.

If a figure can be folded or divided in such a way that the two halves match exactly, such a figure is called a symmetrical figure.
In the given options, the image of the butterfly is the only one which can be divided into two symmetrical halves.

Each point: 2 Marks
(a) The paper will get 4 such symmetrical droplets.

(b) The image about the mirror line is shown below: