7-4: Maps and Scale Drawings

Key Concept

A scale drawing is an enlarged or reduced drawing of an object that is proportional to the actual object.

A scale is the ratio that compares a length in a scale drawing to the corresponding length in the actual object.

Scaling up from inches to feet.

A 1 in.-long scale drawing is made of a 15 ft boat. The scale can be written as:

(1 in.)/(15 ft.)

Part 1

Intro

You can use a scale to find an actual distance given a scale drawing. You can also use a scale to make a scale drawing given an actual distance.

Consider the scale 1 in. = 15 ft. You can write two different ratios.

(15 ft)/(1 in.)


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Table of Contents

Digits, Grade 7, Volume 1, Homework Helper Unit A: Number and Operations Unit B: Expressions, Equations, and Relationships Unit C: Measurement and Geometry Unit D: Proportionality English/Spanish Glossary Formulas Math Symbols Formulas Measures Properties