Pre-Algebra Chapter 6 - Ramsey School District
Pre-Algebra Chapter 6 - Ramsey School District
Pre-Algebra Chapter 6 - Ramsey School District
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Scale Drawings and Models<br />
Vocabulary<br />
• scale drawing<br />
• scale model<br />
• scale<br />
• scale factor<br />
• Use scale drawings.<br />
• Construct scale drawings.<br />
are scale drawings used in everyday life?<br />
A set of landscape plans and a map are shown.<br />
Designers use blueprints<br />
when planning landscapes.<br />
Maps are used to find actual<br />
distances between cities.<br />
TEXAS<br />
New Braunfels<br />
Helotes<br />
10<br />
410 36 37<br />
San Antonio<br />
Somerset<br />
a. Suppose the landscape plans are drawn on graph paper and the side of<br />
each square on the paper represents 2 feet. What is the actual width of a<br />
rose garden if its width on the drawing is 4 squares long?<br />
b. All maps have a scale. How can the scale help you estimate the distance<br />
between cities?<br />
USE SCALE DRAWINGS AND MODELS A scale drawing or a<br />
scale model is used to represent an object that is too large or too small to be<br />
drawn or built at actual size. A few examples are maps, blueprints, model<br />
cars, and model airplanes.<br />
Model cars are<br />
replicas of actual cars.<br />
Concept Check<br />
Why are scale drawings or scale models used?<br />
The scale gives the relationship between the measurements on the drawing<br />
or model and the measurements of the real object. Consider the following<br />
scales.<br />
1 inch 3 feet 1:24<br />
1 inch represents an<br />
actual distance of 3 feet.<br />
1 unit represents an actual<br />
distance of 24 units.<br />
276 <strong>Chapter</strong> 6 Ratio, Proportion, and Percent
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