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Plane Symmetry.

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Presentation on theme: "Plane Symmetry."— Presentation transcript:

1 Plane Symmetry

2 Plane Symmetry A Cuboid A Cuboid has 3 planes of symmetry
A plane of symmetry divides a three dimensional shape into two congruent halves that are mirror images of each other. A Cuboid A Cuboid has 3 planes of symmetry

3 Plane Symmetry A Cuboid A Cuboid has 3 planes of symmetry
A plane of symmetry divides a three dimensional shape into two congruent halves that are mirror images of each other. A Cuboid A Cuboid has 3 planes of symmetry

4 Plane Symmetry A Cuboid A Cuboid has 3 planes of symmetry
A plane of symmetry divides a three dimensional shape into two congruent halves that are mirror images of each other. A Cuboid A Cuboid has 3 planes of symmetry

5 Cuboid 3 Planes of symmetry

6 Can you explain why the plane shown is not a plane of symmetry?
This is similar to the situation for the rectangle which does not have a line of symmetry through its diagonal. Reflection through the diagonal produces a kite. No Diagonal

7 Plane Symmetry A plane of symmetry divides a three dimensional shape into two congruent halves that are mirror images of each other. A square based prism A square based prism has 5 Planes of symmetry

8 Plane Symmetry A plane of symmetry divides a three dimensional shape into two congruent halves that are mirror images of each other. A square based prism A square based prism has 5 Planes of symmetry

9 Plane Symmetry A plane of symmetry divides a three dimensional shape into two congruent halves that are mirror images of each other. A square based prism A square based prism has 5 Planes of symmetry

10 Plane Symmetry A plane of symmetry divides a three dimensional shape into two congruent halves that are mirror images of each other. A square based prism A square based prism has 5 Planes of symmetry

11 Plane Symmetry A plane of symmetry divides a three dimensional shape into two congruent halves that are mirror images of each other. A square based prism A square based prism has 5 Planes of symmetry

12 5 Planes of symmetry Square based prism

13 The 9 Plane Symmetries of the Cube

14 Triangular Based Prisms
An isosceles triangular based prism has 2 planes of symmetry. Triangular Isos

15 Triangular Based Prisms
An isosceles triangular based prism has 2 planes of symmetry.

16 Triangular Based Prisms
An isosceles triangular based prism has 2 planes of symmetry.

17 Triangular Equilateral
Triangular Based Prisms An equilateral triangular based prism has four planes of symmetry. Triangular Equilateral

18 Triangular Based Prisms
An equilateral triangular based prism has four planes of symmetry.

19 Triangular Based Prisms
An equilateral triangular based prism has four planes of symmetry.

20 Triangular Based Prisms
An equilateral triangular based prism has four planes of symmetry.

21 Triangular Based Prisms
An equilateral triangular based prism has four planes of symmetry.

22 Pyramids A rectangular based pyramid has 2 planes of symmetry. Pyramids

23 Pyramids A square based pyramid has 4 planes of symmetry.

24 Regular Tetrahedron: 6 planes of symmetry
Pyramids Regular Tetrahedron: 6 planes of symmetry

25 State the number of planes of symmetry for each shape
Questions State the number of planes of symmetry for each shape 1 2 3 6 2 1 4 5 6 Infinite 1 5 8 9 7 2 3 4

26 Cuboid Worksheet 1 3 Planes of symmetry

27 Worksheet 2 5 Planes of symmetry Square based prism

28 Cube The 9 Plane Symmetries of the Cube 9 Cubes Worksheet

29 Triangular Based Prisms
An isosceles triangular based prism has 2 planes of symmetry. Worksheet 4

30 Triangular Based Prisms
Worksheet 5

31 Pyramids Worksheet 6 Pyramids

32 Worksheet 7 Pyramids

33 Worksheet 8

34 Worksheet 9

35 Worksheet 10 Worksheet 6

36 Worksheet 11

37


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