Open Up - Grade 7 - Mathematics - Unit 1 - Lesson 11

A scale drawing of a car is presented in the following three scales. Order the scale drawings from smallest to largest. (There are about 1.1 yards in a meter, and 2.54 cm in an inch.)

a. 1 in to 1 ft

b. 1 in to 1 m

c. 1 in to 1 yd

1. B
2. C
3. A

A model airplane is built at a scale of 1 to 72.

If the model plane is 8 inches long, how many feet long is the actual airplane?

Quadrilateral A has side lengths 3, 6, 6, and 9. Quadrilateral B is a scaled copy of A with a shortest side length equal to 2. Jada says, “Since the side lengths go down by 1 in this scaling, the perimeter goes down by 4 in total.”

Do you agree with Jada?

Polygon B is a scaled copy of Polygon A using a scale factor of 5. Polygon A’s area is what fraction of Polygon B’s area?

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: