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Download the 15 sprites and 36 scripts of "trigFunEditedV5" and open it in Scratch Project Notes
In this version, I added the ability to fix a side and an angle. You may also want to see notes on prior versions. I also made several small improvements to retain more accuracy while dragging things. If you bump into an edge, things won't stay fixed the way you want it, but if you pull back out from that edge, they will go back to the values that you fixed them at. Occasionally if you loose a fixed value, you just need to click on a dot to get things to jump back. It is not perfect, but it is improved.
If you read version 4's notes, you know that I was going to quit developing this program in Scratch and redevelop it in Flash. Then I realized that I already had the code in place to make one more upgrade, so I will do a different but related project in Flash.
The only other thing I can think of to improve this would be to add some indicators that shows you how you can move the dots in different situations. For now, these notes will due:
1. red dots are fixed
2. green dots move linearly
3. gray dots move circularly
4. black dots move freely
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I tried to test this throughly, but if you find a bug, please let me know. I already know that sometimes the side lengths and angles change slightly when fixing all parts of the triangles, but they should still be close to what they initially were when you fixed that part (by pushing the button).
really interesting!
Thanks. It should come in handy for any teacher doing a lesson on triangles. I can see it being projected onto a white board or smart board and used there. I will be using it for my trig classes, but it could also be used in elementary schools.