Triangles, quadrilaterals, polygons and symmetry!
| Type | Equal Sides | Equal Angles |
|---|---|---|
| Equilateral | 3 equal sides | 3 × 60° |
| Isosceles | 2 equal sides | 2 equal base angles |
| Scalene | No equal sides | No equal angles |
| Right-angled | Varies | One angle = 90° |
| Shape | Properties |
|---|---|
| Square | 4 equal sides, 4 right angles |
| Rectangle | Opposite sides equal, 4 right angles |
| Rhombus | 4 equal sides, opposite angles equal |
| Parallelogram | Opposite sides parallel and equal |
| Trapezium | One pair of parallel sides |
A regular polygon has all sides equal AND all angles equal.
A regular polygon with n sides has n lines of symmetry.
A line of symmetry folds a shape in half so both sides match exactly.
| Shape | Lines of Symmetry |
|---|---|
| Square | 4 |
| Rectangle | 2 |
| Equilateral triangle | 3 |
| Isosceles triangle | 1 |
| Parallelogram | 0 |
Key facts to remember:
How many equal sides does an isosceles triangle have?
How many lines of symmetry does a square have?
How many sides does a pentagon have?
How many lines of symmetry does a regular hexagon have?
How many vertices does an octagon have?
Enter the number of equal sides each triangle has.
Enter the number of lines of symmetry.
Enter the number of sides each polygon has.
Enter the number of lines of symmetry.
Enter the number of vertices each shape has.