# Right Triangle Trigonometry: Intro

- Author:
- Mary E Leahan, Tim Brzezinski

- Topic:
- Cosine, Ratios, Right Triangles, Similar Triangles, Sine, Triangles, Trigonometry

This applet accompanies the

*Right Triangle Trigonometry: Intro*activity packet you received at the beginning of class today. Use this applet to help you complete the guiding questions in this activity.**Key Question:**Hopefully, you noticed that when you keep the blue angle fixed and move only the white vertices, the value of each ratio never changes (even though the side lengths do)!

*Why does this occur?*Explain!