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PPT – Surface Area Cuboid and Cylinder 18Nov09 PowerPoint presentation | free to view - id: 14e9d6-OGY3Z

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Surface Area - Cuboid and Cylinder 18-Nov-09

Objective Calculate the surface of a cuboids and

cylinders

A cuboid is just a name for a box shape

A cylinder is just a name for a tube shape

Level 7

Starter Remembering the formulae (rules) and

things

- The formula for the perimeter of a rectangle is
- L H L H
- L x H x L x H
- L x W 2

H

- a
- b

L

- 2. The formula for the area of a rectangle is
- L H
- L x H
- L x W 2

H

L

Starter Remembering the formulae (rules) and

things

- 3. The Greek letter pi ? is approximately
- 3.41
- 3.14
- 34.1

?

3. b 4. c

- 4. The name for the perimeter of a circle is
- Radius
- Diameter
- Circumference

Starter Remembering the formulae (rules) and

things

- 5. The radius of a circle is
- The distance from the centre to the edge
- The distance across a passing through the centre
- The distance all the way

5. a 6. c

- 6. The diameter of a circle is
- Half of the radius
- Half the circumference
- Twice as big as the radius

Starter Remembering the formulae (rules) and

things

- 7. The formula for the circumference of a circle

is - ?r2
- ?r
- ?d

7. c 8. b

8. The formula for the area of a circle is a)

2?r b) ?r2 c) ?d

Starter Remembering the formulae (rules) and

things

- 9. ?r2 means
- ? x r x r
- ? x r x 2
- ?x ? x r

9. a 10. c

10. The formula for the area of a triangle

is a) Base x Height b) Base Height c) Base

x Height 2

Starter Remembering the formulae (rules) and

things

- 11. The little number 2 on area measures (4 cm2)

means that - The answers is times 2
- The units are square cm.
- The units are doubled

11. b 12. c

12. The area of a shape is a way of measuring

its a) Base b) Volume c) Surface

Objective Calculate the surface of a cuboid

How could a box have an area?

And all boxes have four sides and a top and a

bottom.

(No Transcript)

Top

A H x L Perimeter LHLH

Top A 3 x 4 A 12 cm2

4

4 3 4 3 14

3

Front

Back

Side

Side

Front Back and Sides A 10 x 14 A 140 cm2

10

Surface Area 12 12 140 164 cm2

Bottom A 3 x 4 A 12 cm2

Bottom

Top

A H x L Perimeter LHLH

Top A 5 x 4 A 20 cm2

5

5 4 5 4 18

4

Front

Back

Side

Side

Front Back and Sides A 10 x 18 A 180 cm2

10

Surface Area 20 20 180 220 cm2

Bottom A 5 x 4 A 20 cm2

Bottom

12 cm

2 cm

10 cm

2 cm

3 cm

5 cm

Surface Area 12 120 132 cm2

Top and Bottom 20 cm2 Front Back and Sides

140 cm2 Surface Area 160 cm2

TOP

Area Circle pr2 Circumference pd d 2r pi ?

p 3.14 (to 2 d.p.)

Top A ?r2 A 3.14 x 52 A 78.5 cm2

pd ? 3.14 x 10 31.4

5

Label

A 12 x 314 A 376.8 cm2

12

The surface area is A 2x 78.5 376.8 A

533.8 cm2

Bottom A ?r2 A 3.14 x 52 A 78.5 cm2

BOTTOM

TOP

Area Circle pr2 Circumference pd d 2r pi ?

p 3.14 (to 2 d.p.)

Top A pr2 A 3.14 x 82 A 200.96 cm2

pd ? 3.14 x 16 50.24

8

Label

A 15 x 50.24 A 753.6cm2

15

The surface area is A 2x 200.96 753.6 A

1155.52 cm2

Bottom A pr2 A 3.14 x 82 A 200.96 cm2

BOTTOM

Radius 3 Length 10 SA 244.9

Radius 6 Height 10 SA 602.9

Radius 10 Height 15 SA 1570

Radius 5 cm Height 4 cm

10 cm

3 cm

4 cm

10

2

Make a poster showing how to find the surface

area of these three shapes

900

6

8

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