Symmetry · Year 5
In Year 5 you learn: the symmetry of polygons.
A shape has line symmetry if it can be folded so that the two halves match exactly. It has rotational symmetry if it looks the same after a turn of less than 360°. Symmetry appears in logos, flowers, snowflakes and road signs.
Key facts
- A line of symmetry is a mirror line: each point has a matching point the same distance away on the other side.
- Square 4 lines; rectangle 2; rhombus 2; kite 1; parallelogram 0 (but order 2).
Worked examples
Example 1
How many lines of symmetry does a rectangle have?
Answer: 2