This (STAIR) activity will introduce the three geometric ratios (sine, cosine, tangent) and teach the relationships through a series of examples and activities. As you proceed through the project you will have an opportunity to learn these concepts. There are tutorials, guided examples, and links to additional resources which should all be used before proceeding to the quiz. The quiz portion has three different difficulty levels (Beginner, Moderate, Expert). Once you can complete all three levels you will have a thorough understanding of these concepts.