Page 212 - Math Course 1 (Book 1)

Understanding Scale Drawings

Determine the Scale Find Actual Measurements

LOG CABIN
MODEL CAR A model log cabin is 12 inches high. The actual

A model car is 4 inches long. The actual car is 12 log cabin is 42 feet high. What is the scale of the
feet long. What is the scale of the model? model?
A. 1 inch = 3.5 feet
Write the ratio of the length of the model to the
actual length of the car. Then solve a proportion B. 1 inch = 42 feet
in which the length of the model is 1 inch and the C. 2 inches = 7 feet
actual length is x feet. D. 1 inch = 3.5 inches

model length 4 inches = 1 inches model length Answer
actual length 12 feet x feet actual length

4 • x = 12 • 1 Find the cross
products.

4x = 12 Simplify.

4x 12 Divide each side
4 = 4 by 4.

x = 3 Simplify.

MO. 6 - L9b
Answer The scale is 1 inch = 3 feet.

Using Scale Drawings

Your Turn!

Find Actual Measurements Vocabulary A-Z
Let us learn some vocabulary
SCALE DRAWING
A scale drawing of a new house has a scale of 1
inch = 4 feet. The height of the living room ceiling
is 2.75 inches on the scale drawing. What is the
actual height of the ceiling? Scale Model

A. 1.45 feet is used to represent an object that is too large or too
B. 48 feet small to be drawn or built at actual size.
C. 11 feet
D. 6.88 feet

Answer

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