Talk:Spherical Triangles Exploration
I made a couple of rather major changes here. In the past, I've done a short lecture and given away the formula for defect and area fraction, and done the octahedron for them. In an effort to make this exploration more of a discovery learning experience, I've removed the precise formula - now students need to find the constant of proportionality. Also, to make it easier it now starts with the octahedron. I guess I changed my mind from 2009.
I deleted the questions about regular and semi-regular tessellations. The objective for this Exploration is to understand the area/defect relationship. Regular/semi-regular tessellations is a separate topic. See Regular_Spherical_Tessellations_Exploration.
Also, I'm putting back some of the ones with mirror lines, because if they only do the regular tessellations then they only see regular triangles. They should be able to handle triangles with interesting corner angles.
Bryan 10:40, 23 March 2009 (CDT)
I removed the octahedron in favor of the icosahedron. The point here is that the octahedron is a good one to do on the board by way of introduction to this exploration - it's easy to draw, easy to understand. Bryan 10:55, 23 March 2009 (CDT)