I haven't messed with Wolfram Demonstrations (if you haven't played with them, please do! They were a lifesaver for me when trying to show kids what a vector projection really did) for a while and was happy to see that they now offer the ability to embed an interactive demonstration. Unfortunately, I couldn't get it to work in Schoology, so I'm going to give it a shot here; I don't know if it's user error, Schoology error, or Wolfram error.
Sine, Cosine, and Tangent Using Ratios of Sides of a Right-Angled Triangle from the Wolfram Demonstrations Project by George Beck
It worked! But I only realized that after it posted. Happy to see it, but I wish I could figure out how to get it to go in Schoology.