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Answer :
Let's tackle the questions step by step:
2.1 Determine the number scale. Write your answer as 1 : ...
To determine the number scale, you need to know the dimensions of the drawing compared to the real dimensions. If the drawing shows a 10 cm wall that is 10 meters in reality, the scale is 1:100. Without specific dimensions given, a general example is the best I can provide.
2.2 Measure the wall (in cm) of the East elevation.
This question requires you to measure using a physical plan or drawing. Since there is no diagram here, please measure with a ruler on your plan or drawing for the most accurate result.
2.3 How long (in metres) is the wall on the East elevation in reality?
Once you've measured the wall in cm and have the scale from 2.1, multiply the cm measurement by the scale factor to convert it into meters. For example, if the wall measures 7 cm in the drawing and the scale is 1:100, then in reality, the wall is [tex]7 \times 100 = 700[/tex] cm, which is 7 meters.
2.4 The wall on the left-hand-side of the house has a rectangular shape and is 9m long and 3.2m high. The dimensions of 1 brick are: length = 300mm, breadth = 130mm, height = 120mm. The bricklayer puts 12mm of mortar on each side of the brick when he builds the wall. How many bricks are needed to build this wall if it is a double brick wall?
For a wall 9 m long and 3.2 m high, the total area is:
[tex]9 \text{ m} \times 3.2 \text{ m} = 28.8 \text{ m}^2[/tex]
Converting brick dimensions to meters:
Brick length: 0.3 m
Breadth: 0.13 m
Height: 0.12 m
Including the mortar, each brick will effectively be:
Length with mortar: [tex]0.3 + 0.012 = 0.312[/tex] m
Height with mortar: [tex]0.12 + 0.012 = 0.132[/tex] m
Single brick wall area per brick (front view):
[tex]0.312 \text{ m} \times 0.132 \text{ m} = 0.041184 \text{ m}^2[/tex]
Therefore, the number of bricks needed for a single layer:
[tex]\frac{28.8 \text{ m}^2}{0.041184 \text{ m}^2} \approx 699 \text{ bricks}[/tex]
Since it's a double brick wall, multiply by 2:
[tex]699 \times 2 = 1398 \text{ bricks}[/tex]
Approximately 1398 bricks are needed to build this double brick wall.
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