starter questions
DESCRIPTION
Starter Questions. Scale Drawings & Bearings. Learning Intention. To solve real-life problems using scale drawings. T. X. Y. 55 o. Scale Drawings & Bearings. Problem. The sketch shows a flag-pole YT supported by a wire. The distance from X to Y is 6m and angle TXY = 55 o. - PowerPoint PPT PresentationTRANSCRIPT
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Starter Questions
2.
(a) 15.673 (b) 13.55 (c) 23.49
1. 85.7 - 7.8
Calculate 60
3. 75% of 360p
4. Round to 1 decimal place
5. Find the value of x 5x +35 = 90
% of 120
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Learning Intention
To solve real-life problems using scale
drawings.
Scale Drawings & Bearings
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Problem
The sketch shows a flag-pole YT supported by a wire. The distance from X to Y is 6m and angle TXY = 55
o.
55oX
T
Y
6m
Make a scale drawing and workOut the real height of the pole.
Use a scale of 1cm = 2m
Scale Drawings & Bearings
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Scale Drawings & Bearings
55oX
T
Y
6m
SolutionStep 1: Draw line XY=3cm
X Y
Using a scale of 1cm = 2m
Step 2: Draw a line straight up from Y.Step 3: Measure angle 55
o
from X.Step 4: Draw line from X to vertical line and mark T at crossover point.
T
Step 5: Measure length YT.Step 6: Multiply length YT. by scale factor.
4.3cm
4.3 x 2 = 8.6mFlag pole is 8.6m high
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Now try Exercise 3Ch17 (page 199)
Harder Scale Drawings