1. Use Proportions to Solve Geometry Problems
6.2
Use Proportions to Solve Geometry Problems

2. CROSS PRODUCT PROPERTY

3. PROPERTIES OF PROPORTIONS

4. EXAMPLE
Write three true proportionality statements

5. EXAMPLE
Is the following statement true or false. Why?

6. EXAMPLE

7. Your Turn

8. SCALE DRAWINGS AND SCALE
Scale Drawing: A drawing that is the same shape as the object it represents
Maps, Blueprints, Paintings, Photographs
Scale: A ratio that describes how the dimensions in the drawing relates to the actual dimensions of the objects

9. EXAMPLE
The distance between two locations on a map is given along with the actual distance between the locations. Find the scale of the map.
Map Distance: 3 in; Actual Distance: 100 yd
Map Distance: 16 in; Actual Distance: 800 ft

10. EXAMPLE
The blueprint shows a scale drawing of a cell phone. The length of the antenna on the blueprint is 5 cm. The actual length of the antenna is 2 cm. What is the scale of the blueprint?