lesson 6-3 pages 276-280 scale drawings and models lesson check 6-2
TRANSCRIPT
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Lesson 6-3 Pages 276-280
Scale Drawings and Models
Lesson Check 6-2
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What you will learn!1. How to use scale drawing.
2. How to construct scale drawings.
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Scale drawingScale drawingScale modelScale modelScaleScaleScale factorScale factor
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What you really need to know!
A scale gives the relationship between the measurements on the drawing or model and the measurements of the real object.
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Example 1:
A map has a scale of 1 inch = 8 miles.
Two towns are 3.25 inches apart on the map.
a. What is the actual distance between the two towns?
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mi
in
mi
in
d
25.3
8
1
1•d = 8•3.25
d = 26 miles
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A map has a scale of 1 inch = 8 miles.
b. What is the scale factor?
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8 miles must be changed to inches!
8 x 63,360 = 506,880
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in
in
mi
in
880,506
1
8
1
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Example 2:
A model car is 4 inches long. The actual car is 12 feet long. What is the scale of the model?
ft
in
ft
in
3
1
12
4
1 inch = 3 feet
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Example 3:
Sheila is designing a patio that is 16 feet long and 14 feet wide. Make a scale drawing of the patio. Use a scale of 0.5 inches = 4 feet.
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16 feet long and 14 feet wide.
0.5 inches = 4 feet.
ft
L
ft
in
164
5.0
ft
W
ft
in
144
5.0
L = 2 inches
W = 1.75 inches
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2 inches
1.75 inches
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Page 278-279
Guided Practice
#’s 3-7
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15 feet long and 10 feet wide.
0.5 inches = 10 feet.
ft
L
ft
in
1510
5.0
ft
W
ft
in
1010
5.0
L = 3/4 inch
W = 0.5 inch
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3/4 inch
1/2 inch
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Pages 276-278 with someone at home and
study examples!
Read:
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Homework: Pages 279-280
#’s 8-20 all
#’s 23-44 Skip #25
Lesson Check 6-3
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Page
737
Lesson 6-3
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Lesson Check 6-3