Class 6 · Chapter 13

Symmetry

Line symmetry; figures with one, two or more lines of symmetry.

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Tip: open the NCERT PDF for the original chapter text alongside the notes here.

Detailed theory

A figure has a line of symmetry (axis) if folding along it makes both halves match exactly. Some figures have

0

1

2

or many axes.

Key concepts & formulas

A figure has line symmetry if it can be folded along a line so both halves match.

The fold line is the axis or line of symmetry.

A rectangle has

2

lines of symmetry; a square has

4

A circle has infinitely many lines of symmetry.

An equilateral triangle has

3

lines of symmetry.