1. A scale drawing is a drawing in which all parts of the drawing are reduced or enlarged by the same scale factor.
A scale is a ratio that compares the measurements used in the drawing and the actual measurements.

2. Example 1: picture height actual height = 1 cm 3 in = 2 cm ? in
The scale of the picture is 1 cm. : 3 in. What is the actual height of the cup?
The scale tells us that every centimeter = 3 inches
picture height actual height = 1 cm 3 in = 2 cm ? in
The actual height is 6 in.

3. Example 2: picture height actual height = 1 in 10 cm = 3 in ? cm
The scale of the picture is 1 in. : 10 cm. What is the actual height of the penguin?
The scale tells us that every inch = 10 centimeter
picture height actual height = 1 in 10 cm = 3 in ? cm
The actual height is 30 cm.

4. Practice A scale drawing has a scale of 3 inches : 10 feet.
Find the actual length when the drawing length is the following measurements:
inches inches
inches inches
3. 6 inches inches