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Slide 1: **Tekstslide**

WiskundeMiddelbare schoolhavoLeerjaar 1

In deze les zitten **39 slides**, met **interactieve quizzen** en **tekstslides**.

- A three-dimensional (3-D) shape

- A three-dimensional (3-D) shape

- Width, length, height...

Solids

- A three-dimensional (3-D) shape

- Width, length, height...

- What solids have a square as a base?

- What solids have a square as a base?

- What solids have a square as a base?

- What solids have a square as a base?

- What solids have a square as a base?

Cube

- What solids have a square as a base?

Cube

Box

- What solids have a square as a base?

Cube

Box

Square-based

pyramid

- What solids have a triangle as a base?

- What solids have a triangle as a base?

- What solids have a triangle as a base?

- What solids have a triangle as a base?

Triangular-based

pyramid

- What solids have a circle as a base?

- What solids have a circle as a base?

- What solids have a circle as a base?

- What solids have a circle as a base?

Circular-based pyramid / Cone

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

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

- Not all solids have a constant cross-section.

- Prisms do have a constant cross-section.

- For prisms, the cross-section names the prism.

Is a box always a prism?

A

Yes

B

No

- 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.

Does a pyramid have a constant cross-section?

A

Yes

B

No

- Because pyramids don't have a constant cross-section we use their base to name them.

- For pyramids, the base thus names the pyramid.

- For pyramids, the base names the pyramid.

- What's this solid called?

- For pyramids, the base names the pyramid.

- What's this solid called?

- A face is a flat surface of a solid.

- A face is a flat surface of a solid.

- An edge is the line where two faces meet.

- 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.

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

How many faces does a box have?

A

2

B

4

C

6

D

8

How many vertices does a square-based pyramid have?

A

3

B

4

C

5

D

6

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

How many edges does a triangular-based pyramid have?

A

4

B

6

C

8

D

12

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

Make:

9C: 2-D representations of 3-D shapes

- Questions 1, 2 and 3

Hand in for feedback! (Optional)