Another math teacher here at Scattergood asked me at dinner, “What about trigonometry on other shapes, like ellipses?” We know about hyperbolic cosines, but what about other things?
I whipped up this geogebra applet. There are 3 green points you can find and drag – make sure you play with all three, because they’re pretty cool!
|
Riley Lark, Created with GeoGebra |
I didn’t go to the trouble to make this one interactive, but here’s a square cosine wave:
Jon Ingram
April 8, 2010 at 6:59 am
Very interesting – I particularly like your use of the ‘locus’ tool, which people often find quite mysterious. It would interesting to try to derive cartesian equations for some of your elliptic sines/cosines.
On another topic, I see you have picked exactly the same WordPress theme as me — got me very confused when I clicked on the link: ‘I don’t remember writing this…’!
David Cox
April 8, 2010 at 3:50 pm
I’d love to check this out, but for some reason the GGB applet keeps spooling. I like what you’re doing with the GeoGebra. Keep ‘em coming.
Steve Phelps
April 9, 2010 at 7:18 am
Great work! I enjoy seeing what others are doing with GeoGebra, and I enjoy seeing other GeoGebra Nuts out there.
Whit Ford
April 10, 2010 at 10:20 pm
Way cool! Thank you!
Riley Lark
April 11, 2010 at 10:08 am
Thanks for the comments, guys – I really like geogebra, and I think it’s a vital tool for math teachers. What else is so powerful but easy enough for students to learn?
I’ll be happy to detail answers to any geogebra questions I can answer!