Drawing. Presentation scope This presentation is purely for you to practice : –Drawings of different object views –Calculating the material required.
Post on 18-Dec-2015
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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
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
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
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