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activity
Take a sheet of paper and make a greeting card on it.
Fold it from the middle that is into two equal halves.
Now, open the fold and observe.
What do you observe? Is the shape symmetrical about crease line formed?

Line of Symmetry

A figure is said to be symmetrical about a line if the portion of the
figure on one side of that line perfectly matches or exactly overlaps Remember
with the portion on the other side. A dotted line is used to
The line about which a figure is symmetrical is called the line of represent the line of symmetry
symmetry or axis of symmetry. of an object or a picture.
A symmetrical figure may have more than one line of symmetry.

The above figures show the horizontal line of symmetry, vertical line of symmetry, and diagonal
line of symmetry.
Vertical Line of Symmetry: Figures having only vertical line of symmetry are as follows:

Think and Answer
Horizontal Line of Symmetry: Figures having only horizontal
line of symmetry are as follows: Name any three internal organs
of a human body, which have a
line of symmetry.

Figures having Multiple Lines of Symmetry: Figures having more than one line of symmetry,
which includes vertical and horizontal lines, are as follows:

(a) (b) (c) (d)

(e) (f) (g) (h)

Mathematics-7 240