lesson 6-3 pages 276-280
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Lesson 6-3 Pages 276-280. Scale Drawings and Models. Lesson Check 6-2. What you will learn!. How to use scale drawing. How to construct scale drawings. Vocabulary. What you really need to know!. - PowerPoint PPT PresentationTRANSCRIPT
Lesson 6-3 Pages 276-280
Scale Drawings and Models
Lesson Check 6-2
What you will learn!1. How to use scale drawing.
2. How to construct scale drawings.
Scale drawingScale drawingScale modelScale modelScaleScaleScale factorScale factor
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.
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?
miin
miin
d25.3
81
1•d = 8•3.25
d = 26 miles
A map has a scale of 1 inch = 8 miles.
b. What is the scale factor?
8 miles must be changed to inches!
8 x 63,360 = 506,880
inin
miin
880,5061
81
Example 2:
A model car is 4 inches long. The actual car is 12 feet long. What is the scale of the model?
ftin
ftin
31
124
1 inch = 3 feet
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.
16 feet long and 14 feet wide.0.5 inches = 4 feet.
ftL
ftin
1645.0
ftW
ftin
1445.0
L = 2 inches
W = 1.75 inches
2 inches
1.75 inches
Page 278-279
Guided Practice
#’s 3-7
15 feet long and 10 feet wide.0.5 inches = 10 feet.
ftL
ftin
15105.0
ftW
ftin
10105.0
L = 3/4 inch
W = 0.5 inch
3/4 inch
1/2 inch
Pages 276-278 with someone at home and
study examples!
Read:
Homework: Pages 279-280
#’s 8-20 all
#’s 23-44 Skip #25
Lesson Check 6-3
Page
737
Lesson 6-3
Lesson Check 6-3