Drawing. Presentation scope This presentation is purely for you to practice : –Drawings of different object views –Calculating the material required.

DrawingDrawing

Presentation scope

• This presentation is purely for you to practice : – Drawings of different object views– Calculating the material required

AreaArea

Materials such as plastic and plywood are sold per square metre

1 metre

1 m

etre

1 square metre

3 metres

2 m

etre

s6 square metres

ExerciseExercise

I wish to cover the roof of the chicken hut in plastic sheeting to make it waterproof.

• How much plastic should I buy?

• How much should I buy to cover the bamboo hut roof?

• How much should I buy to cover the weather station roof?

Your Turn!Your Turn!

Now find the area of the roof of your design!

SCALE

?

Area of a TriangleArea of a Triangle

4 metres

4 m

etre

s

5 metres

4 m

etre

s

Area = 0.5 x base x height

Hei

gh

t

Hei

gh

t

Base Base

8 square metres 10 square

metres

DrawingDrawing

I wish to paint all four sides of the bamboo hut and weather station.

I wish to cut two new full metal panels for the ends of the chicken hut, and paint them.

How many pots of paint do I need?

How much will it cost?

1 pot paints 2 square metres

50 rupees per pot

Your Turn!Your Turn!

Now find the areas of the walls of your design!

SCALE

Activity – 1Activity – 1

Activity – 2Activity – 2

Activity – 3Activity – 3

DrawingDrawing

SCALE

Circumference = hello x diameter

CirclesCircles

Diameter

Radius

= 3.14Area = x radius2

(radius2 = radius x radius)

DrawingDrawing

What is the area of the base of your water tank?

Area = x radius2

VolumeVolume

Volumes are measured in cubic metres

1 metre

1 m

etre

1 square metre

1 metre

1 m

etre

1 cubic metre

1 metre

DrawingDrawing

2 metres

3 m

etre

s

12 cubic metres

2 metre

s

1 metre

0.5

met

res

1 cubic metre

2 metres

Volume of a CylinderVolume of a Cylinder

2 metres

radius

hei

gh

t

3 metres

36 cubic metres

Area of circle = x radius2

(radius2 = radius x radius)

Volume cylinder = Height x Area

Volume cylinder = 3 x 12

Area of circle = 3 x 2 x 2

= 12 m2

= 36 m3

DrawingDrawing

How many litres of water can my tank hold?

Hint: 1 cubic metre = 1000 litres