1. All about Shapes

2. Properties of Shapes Number of sides Number of angles
Number of lines of symmetry
Regular or irregular
Right Angles
Parallel lines

3. Shapes
Key Words
Triangles
Polygons
Regular Shapes

4. Triangles
Shapes with 3 sides!

5. What type of triangle is this?

6. An Equilateral Triangle

7. How many lines of symmetry has an Equilateral Triangle got?1 2 3

8. Properties of an Equilateral Triangle
Has 3 equal sides
Has 3 equal angles
Each angle is a 60o angle
Has 3 lines of symmetry
Is a regular shape

9. What type of triangle is this?

10. An Isosceles Triangle

11. How many lines of symmetry has an Isosceles Triangle got?1

12. Properties of an Isosceles Triangle
Has 2 equal sides
Has 2 equal angles
Has 1 line of symmetry
Is an irregular shape

13. What type of triangle is this?

14. A Scalene Triangle

15. How many lines of symmetry has a Scalene Triangle got?
None!

16. Properties of an Scalene Triangle
Has NO equal sides
Has NO equal angles
Has NO lines of symmetry
Is an irregular shape

17. What type of triangle is this?

18. A Right Angled Triangle

19. A Right Angled Triangle is different
It may be scalene
or it may be isosceles
But it always has a right angle!

20. Properties of a Right Angled Triangle
Has 1 right angle
May be an isosceles triangle
May have 1 line of symmetry
Is an irregular shape
It will be isosceles and have 1 line of symmetry when these 2 sides are equal.

21. Key Words
Regular Shape
Parallel
Perpendicular
Vertex
Diagonal
Bisect

22. Regular Shape Shapes are regular when
All their sides are the same length
All their angles are the same size

23. when they are always the same distance apart.
Parallel
Lines are parallel
when they are always the same distance apart.

24. when they meet at right angles.
Perpendicular
Lines are perpendicular
when they meet at right angles.

25. Vertex
A Vertex is a corner of a shape where two lines meet.

26. Diagonal
A Diagonal is a straight line that joins one corner (vertex) of a shape to a non adjacent corner (vertex)

27. Bisect
A line that cuts a shape exactly in half, Bisects the shape

28. Polygons
Shapes with many sides!

29. What shape is this?

30. A Hexagon

31. How many lines of symmetry has a Hexagon?4 1 2 5 6 3

32. Properties of a Regular Hexagon
Has 6 equal sides
Has 6 equal angles
Has 6 lines of symmetry

33. What shape is this?

34. A Pentagon

35. How many lines of symmetry has a Pentagon?1 3 4 5 2

36. Properties of a Regular Pentagon
Has 5 equal sides
Has 5 equal angles
Has 5 lines of symmetry

37. Polygons
Shapes with many sides!

38. Lines of Symmetry - Look at these shapes
Can you suggest a rule?

39. How many lines of symmetry?
Look at these shapes
Heptagon
Octagon
How many lines of symmetry?

40. Lines of symmetry
Heptagon
Octagon 7 8