Chapter 7, Lesson 9


7-9.A find scale factors
Find the scale factor: 12-in. model of a 32-ft train

7-9.B write proportions to solve problems involving scale drawings
Using a scale of 1 in. : 2 ft, a drawing of a car shows the length of the car as 6.5 inches. Write a proportion that can be used to find the actual length, a, of the car.