Unit 12
Dimensions
1)
seale 1 : 100
This rectangular solid has a length of 5m
It is 5m long
It has width of 3.5m
It is 3.5m wide
It has a height of 1m
It is 1m high
It has a surface area of 52m2 (square metres). (A = 2 hw + 2 hl + 2lw )
It has a volume of 17.5m2 (cubic metres). ( V = 1 hw )
2)
Scale 1 : 10
This cylinder has a length of 65 cm
It is 65 cm long
It has a radius of 10 cm
It has a diameter of 20 cm
It has a surface area of 4714 square centimeters. ( A = r2 + 2 r2)
It has a volume of 20428 cubic centumetres ( V = r2h )
3)
5m
6m
10m scale 1: 200
This water tank has a length of 10m
It is 10m long
It has a width of 5m
It is 5m wide
It has a height of 6m
It is 6m high
It has a capacity of 300 cubic metres
or 300.000 litres
or 3.000 hectolitres
4)
oil rig earth surface
Scale 1 : 3000 This oil rig has drilled to a depth of 150 metres
5)
2 cm
10 cm
This tube has an external diameter of 2 cm
It has an internal diameter of 1 – 5cm
It has a bore of 1 – 5 cm
The wall of the tube is 0 – 25 cm thick
It has a thickness of 0,25cm
It has a surface area of 112.75cm2
( A = d
it has a capacity of 17.68cm3 ( C = r2h )
1 mm
6)
This glass tube has a bore of 1mm
It has a fine or narrow bore
It has a capacity of 23.6mm3
3 cm
Practice 1
Describe the following figures. The measurements are given
1) 2)
3 cm
4 cm
3)
5 cm 3 cm
4 cm
4)
3 cm
2 cm
2,5 cm
5)
4 cm
6) 7)
1,5cm
3 cm
Practice 2
Use your ruler
1) EartnsSarface
air
Water
Scale 1 : 1000
Above is a diagram of a cylindrical well
Describe the well
2)
Front of view (elevation)
scale 1 : 100 Top view
above are the elevation and plan of a water tank
3)
Sice view
Scale 1:5
Front view
Above are the side view and frontal view of tube
Describe the tube
Practice 3
1. A. table a length of 1 meter and width of 80cm. The top of the table is 4cm thick.
Te overall height of the table is 64 cm. The legs of the table measure 60 x 5 x 5.
draw a side view of the table on the scale 1 :20
2. A clock has a circular face with a diameter of 20cm. The minute hand is 8cm long
and the hour hand is 5cm long. The case of the clock is rectangular with a length
of 30cm and a height of 25cm. Draw a frontal view of the clock on the scale 1:2
with the clock showing the time at 10 minutes past 10.
3. A country national flag is 180cm wide and 100cm deep. It consists of three equal
vertical stripes, blue, green and black from left to right. In the central position
there is a white disc with a diameter of 50cm. Draw a picture of this flag on the
