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🔵Polygons — Sides & Corners
A polygon is a closed shape made of straight sides. We name polygons by their number of sides:
| Triangle | 3 sides |
| Quadrilateral | 4 sides (square, rectangle…) |
| Pentagon | 5 sides |
| Hexagon | 6 sides |
A polygon has the same number of corners (vertices) as sides.
👀 See a worked example
How many sides does a pentagon have?
5 sides.
What do we call any 4-sided polygon?
A quadrilateral (square, rectangle, rhombus, etc.).
🤖 Vidi's Key Points
- A polygon is a closed shape with straight sides.
- Triangle 3, quadrilateral 4, pentagon 5, hexagon 6 sides.
- A polygon has as many corners (vertices) as sides.
🟢Lines of Symmetry
A shape has a line of symmetry if you can fold it so the two halves match exactly. Some shapes have more than one line of symmetry.
- A square has 4 lines of symmetry.
- A rectangle has 2.
- A circle has endless lines of symmetry.
- A scalene triangle has none.
👀 See a worked example
How many lines of symmetry does a square have?
4.
Does the letter A have a line of symmetry?
Yes — a vertical line down the middle. 1 line.
🤖 Vidi's Key Points
- A line of symmetry folds a shape into two matching halves.
- Square 4, rectangle 2, circle endless, scalene triangle 0.
- Some shapes have more than one line of symmetry.
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