Lesson 7
Units in Scale Drawings
Problem 1
A scale drawing of a car is presented in the following three scales. Order the scale drawings from smallest to largest. Explain your reasoning. (There are about 1.1 yards in a meter, and 2.54 cm in an inch.)

1 in to 1 ft

1 in to 1 m

1 in to 1 yd
Solution
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Problem 2
Elena finds that the area of a house on a scale drawing is 25 square inches. The actual area of the house is 2,025 square feet. What is the scale of the drawing?
Solution
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Problem 3
Which scales are equivalent to 1 inch to 1 foot? Select all that apply.
1 to 12
\(\frac{1}{12}\text{ to }1\)
100 to 0.12
5 to 60
36 to 3
9 to 108
Solution
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Problem 4
Which of these scales are equivalent to 3 cm to 4 km? Select all that apply. Recall that 1 inch is 2.54 centimeters.
0.75 cm to 1 km
1 cm to 12 km
6 mm to 2 km
0.3 mm to 40 m
1 inch to 7.62 km
Solution
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Problem 5
These two triangles are scaled copies of one another. The area of the smaller triangle is 9 square units. What is the area of the larger triangle? Explain or show how you know.
Solution
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Problem 6
Figures R, S, and T are all scaled copies of one another. Figure S is a scaled copy of R using a scale factor of 3. Figure T is a scaled copy of S using a scale factor of 2. Find the scale factors for each of the following:
 From T to S
 From S to R
 From R to T
 From T to R
Solution
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(From Unit 2, Lesson 3.)