# Unit 5: Geometry - 9C

9C: 2-D representations of 3-D shapes
Class: T1A
Unit 5
1 / 39
Slide 1: Slide
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This lesson contains 39 slides, with interactive quizzes and text slides.

## Items in this lesson

9C: 2-D representations of 3-D shapes
Class: T1A
Unit 5

#### Slide 1 -Slide

Solids

- A three-dimensional (3-D) shape

#### Slide 2 -Slide

Solids

- A three-dimensional (3-D) shape
- Width, length, height...

Solids

#### Slide 4 -Mind map

Solids

- A three-dimensional (3-D) shape
- Width, length, height...

- What solids have a square as a base?

#### Slide 5 -Slide

Solids

- What solids have a square as a base?

#### Slide 6 -Slide

Solids

- What solids have a square as a base?

#### Slide 7 -Slide

Solids

- What solids have a square as a base?
Cube

#### Slide 8 -Slide

Solids

- What solids have a square as a base?
Cube
Box

#### Slide 9 -Slide

Solids

- What solids have a square as a base?
Cube
Box
Square-based
pyramid

#### Slide 10 -Slide

Solids

- What solids have a square as a base?
Cube
Box
Square-based
pyramid
Triangular
prism

#### Slide 11 -Slide

Solids

- What solids have a triangle as a base?

#### Slide 12 -Slide

Solids

- What solids have a triangle as a base?

#### Slide 13 -Slide

Solids

- What solids have a triangle as a base?
Triangular-based
pyramid

#### Slide 14 -Slide

Solids

- What solids have a triangle as a base?
Triangular-based
pyramid
Triangular prism

#### Slide 15 -Slide

Solids

- What solids have a circle as a base?

#### Slide 16 -Slide

Solids

- What solids have a circle as a base?

#### Slide 17 -Slide

Solids

- What solids have a circle as a base?
Circular-based pyramid / cone

#### Slide 18 -Slide

Solids

- What solids have a circle as a base?
Circular-based pyramid / Cone
Circular prism / Cylinder

#### Slide 19 -Slide

Cross-section
- A cross-section of a solid is literally a slice of a solid. For example...

#### Slide 20 -Slide

Cross-section
- A cross-section of a solid is literally a slice of a solid. For example...

#### Slide 21 -Slide

Cross-section prisms
- Not all solids have a constant cross-section.
- Prisms do have a constant cross-section.
- For prisms, the cross-section names the prism.

#### Slide 22 -Slide

Is a box always a prism?
A
Yes
B
No

#### Slide 23 -Quiz

Cross-section prisms
- If you take a slice from a box, you will get a rectangle, so the cross-section is a rectangle.
- This means a box is also called a rectangular prism.

#### Slide 24 -Slide

Does a pyramid have a constant cross-section?
A
Yes
B
No

#### Slide 25 -Quiz

Bases pyramids
- Because pyramids don't have a constant cross-section we use their base to name them.
- For pyramids, the base thus names the pyramid.

#### Slide 26 -Slide

Bases pyramids
- For pyramids, the base names the pyramid.

- What's this solid called?

#### Slide 27 -Slide

Bases pyramids
- For pyramids, the base names the pyramid.

- What's this solid called?

Pentagonal based pyramid

#### Slide 28 -Slide

Face, Edge, Vertex

#### Slide 29 -Slide

Face, Edge, Vertex
- A face is a flat surface of a solid.

#### Slide 30 -Slide

Face, Edge, Vertex
- A face is a flat surface of a solid.

- An edge is the line where two faces meet.

#### Slide 31 -Slide

Face, Edge, Vertex
- A face is a flat surface of a solid.

- An edge is the line where two faces meet.

- A vertex is a point at which three or more edges meet.

#### Slide 32 -Slide

Face, Edge, Vertex
- A cube has 6 faces, 8 vertices and 12 edges

#### Slide 33 -Slide

How many faces does a box have?
A
2
B
4
C
6
D
8

#### Slide 34 -Quiz

How many vertices does a square-based pyramid have?
A
3
B
4
C
5
D
6

#### Slide 35 -Quiz

Face, Edge, Vertex
- A square-based pyramid has 5 faces, 8 edges  and 5 vertices

#### Slide 36 -Slide

How many edges does a triangular-based pyramid have?
A
4
B
6
C
8
D
12

#### Slide 37 -Quiz

Face, Edge, Vertex
- A triangular-based pyramid has 4 faces, 6 edges  and 4 vertices

#### Slide 38 -Slide

Make:
9C: 2-D representations of 3-D shapes
- Questions 1, 2 and 3

Hand in for feedback! (Optional)
Homework: