Angles and symmetry
Lesson 7 of 10
Lines of symmetry
Objective. Find all lines of symmetry in common shapes.
The key idea
A line of symmetry folds the shape so both halves match exactly. A square has 4, a rectangle 2, an equilateral triangle 3, a circle infinitely many.
Worked example
How many lines of symmetry does a rectangle have?
- 1Fold across the middle horizontally — halves match.
- 2Fold vertically — halves match.
- 3Diagonal folds do not match.
Answer: 2
Practice
Each question comes with a picture and a listen button. Try it first, then reveal the answer.
Common mistake. Counting rectangle diagonals as lines of symmetry.
Your progress
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