# Prove Triangles Similar by AA - PowerPoint PPT Presentation

1 / 24

Prove Triangles Similar by AA. 6.4. Another Postulate. All you need are any 2 congruent angles for 2 triangles to be similar. Why only 2 angles?. We know that the sum of the interior angles has to be 180. Therefore, the third angle also has to be congruent.

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

Prove Triangles Similar by AA

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

## Prove Triangles Similar by AA

6.4

### Another Postulate

All you need are any 2 congruent angles for 2 triangles to be similar.

### Why only 2 angles?

• We know that the sum of the interior angles has to be 180.

• Therefore, the third angle also has to be congruent.

yes

yes

yes

no

no

yes

no

yes

Can’t tell

Yes

Yes

Can’t tell

yes

yes

yes

### Proportion Word Problems

• Molly wants to know the height of the flagpole in front of the town hall. She sees that it casts a shadow 24 ft long. She drives a stake into the ground beside the flagpole. The stake is 4 ft high with a shadow 2 feet long. How tall is the flagpole?

• The scale on a map says that 1 inch equals 150 miles. How many miles apart are two cities if you measure 4 ½ inches between them?