1. a) List two jobs where scale models are used. b) List two jobs where scale drawings are used.

Welding: Principles and Applications (MindTap Course List)
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Chapter21: Reading Technical Drawings
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Please answer all of the following
Understanding Proportions
A proportion is made when you
have two ratios describing the
same objects.
For example:
Jack drives a large dump truck
in Northern Saskatchewan. His
CAT
truck is taller than his high school
and can haul up to 360 tonnes
of rock. He took a picture of his
dump truck next to his SUV. His
SUV is about 2m tall. How tall is
the dump truck?
Solution: The two dimensions that you are comparing are:
Height of truck: Height of SUV
Remember that we can write a ratio as a fraction
height of truck
height of SUV
We have two different versions of this ratio – one is in the picture, and one is in
real life. We can write these ratios as a proportion:
height of truck in picture _ height of truck in"real life"
height of SUV in"real life"
height of SUV in picture
We can then put in the numbers that we know and then solve for the unknown.
5 ст
%D
1 ст
2 m
5 ст
(2m)(tem)
(2m)(1cm)
1em 2m
10m X em =X-€m
10m = X
The truck is 10m tall.
Transcribed Image Text:Understanding Proportions A proportion is made when you have two ratios describing the same objects. For example: Jack drives a large dump truck in Northern Saskatchewan. His CAT truck is taller than his high school and can haul up to 360 tonnes of rock. He took a picture of his dump truck next to his SUV. His SUV is about 2m tall. How tall is the dump truck? Solution: The two dimensions that you are comparing are: Height of truck: Height of SUV Remember that we can write a ratio as a fraction height of truck height of SUV We have two different versions of this ratio – one is in the picture, and one is in real life. We can write these ratios as a proportion: height of truck in picture _ height of truck in"real life" height of SUV in"real life" height of SUV in picture We can then put in the numbers that we know and then solve for the unknown. 5 ст %D 1 ст 2 m 5 ст (2m)(tem) (2m)(1cm) 1em 2m 10m X em =X-€m 10m = X The truck is 10m tall.
1.
a) List two jobs where scale models are used.
b) List two jobs where scale drawings are used.
a) List two situations where a diagram or model would need to be
reduced.
b) List two cases where a diagram or model would need to be enlarged.
Alli wants to sew a sari. The diagram below shows a scale drawing of a
sari. If the width of sari fabric is usually 46 inches, what length of fabric
would Alli need for her sari?
1.5 cm
7 cm
2.
3.
Transcribed Image Text:1. a) List two jobs where scale models are used. b) List two jobs where scale drawings are used. a) List two situations where a diagram or model would need to be reduced. b) List two cases where a diagram or model would need to be enlarged. Alli wants to sew a sari. The diagram below shows a scale drawing of a sari. If the width of sari fabric is usually 46 inches, what length of fabric would Alli need for her sari? 1.5 cm 7 cm 2. 3.
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