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Symmetry

Eva is making a card for her parents for their wedding anniversary.

For this, she takes a sheet of paper and first folds it into half. She draws a curve and cuts
out a piece. When she opens it, she gets a heart shape as shown here.

To make the envelope, she draws the outline
on a sheet of paper and cuts it out along the
boundary, as shown here.

Then she folds and fixes the triangular flaps.

Now, her envelope is ready.

She writes her wishes on the card, decorates and puts it inside the
envelope. symmetry
Line of
Did you notice that the shapes Eva used are the same on both sides? Anniversary
Happy
Figure which can be divided into two identical parts are called
symmetrical.

The dividing line is called the line of symmetry.
Identifying Symmetrical Figures using a mirror

Take a triangular, rectangular and a circular

piece of paper. Fold each one in half and cut
them along the line of symmetry.

Project Experiential Learning
There is symmetry in nature as well. Collect a few leaves and flowers from

your school/home garden. See if you can divide them into two identical halves.

Mathematics-3 137