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# Prove Triangles Similar by AA - PowerPoint PPT Presentation

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.

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### Prove Triangles Similar by AA

6.4

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

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

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

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?