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Multiple Choice

$$\Delta PQR\ is\ similar\ to\ \Delta STU$$  What side corresponds to side UT?

• PQ

• RQ

• QR

• QP

Multiple Choice

Scale Factor is a ratio comparing:

• the new value to the original value

• the original value to the new value

Multiple Choice

Triangle PQR is shown. Its original lengths are multiplied by 2.5. What are the new side lengths of P’Q’R’?

• PQ: 20, RQ: 42.5, RP: 37.5

• PQ: 16, RQ: 34, RP: 30

• PQ:4, RQ:8.5, RP: 7.5

Multiple Choice

Rectangle ABCD has been enlarged to form rectangle A’B’C’D’. What is the scale factor?

• 2

• 2.5

• 3

• 3.5

Reminder: You have independent practice

1. Classifying Triangles

2. Intro to Scale Factors

Open Ended

Exit Ticket: Triangle PRQ was enlarged to form triangle SUT. What is the scale factor?

Scale drawing

In order for an original drawing to be reduced or enlarged, every corresponding side must be PROPORTIONAL to the original measurements.

We use MULTIPLICATION to make things bigger or smaller.

Open Ended

Is Figure B an enlargement of Figure A? Explain why or why not.

Multiple Choice

A scale drawing showing the distance from your house to the school has a scale of 1.5 cm to 5 km. If the actual distance from your house to the school is 30 km, what is the distance on the drawing?

• 3 1/3 cm

• 9 cm

• 3 1/3 km

• 9 km

Multiple Choice

Carly lives in Scottsdale, AZ and plans to go visit downtown Glendale, AZ. The map with a scale of 2 cm for every 4 km shows the actual distance to be 10 km. What is the scale distance on the map?

• 40 cm

• 20 cm

• 2/ 5 cm

• 5 cm

Multiple Choice

Find the width of a parking spot on a scale drawing if the parking spot is 2.5 meters wide and the scale is 1 centimeter = 2 meters

• 5 m

• 1.25 cm

• 0.8 cm

• 1.25 m

Multiple Choice

The scale on a map is 1 cm for every 400 km. If Maine and Japan are 22 cm apart on the map, what is the distance between Maine and Japan?

• 8,800 km

• 18.18 cm

• 800 km

• 18.18 km