Ya'll know about @property and some my remember a few months back I was sharing about a Circle type where you could change the radius, area, or perimeter, by simply assigning to these attributes, and the other two would magically co-vary.
Likely many people have thought of that. Great way to teach / learn geometry. Like this: >>> c = Circle() >>> c.area = 50 >>> c.radius 3.989422804014327 >>> c.circumference = 5 >>> c.radius 0.7957747154594768 https://github.com/4dsolutions/Python5/blob/master/circle2.py I don't think a math teacher needs to painstakingly go through all the code before using this API. Go ahead and work with finished programs. We'll look at the source code by and by. The goal is to interact with the instances as modeling geometric shapes with co-varying dimensions. I haven't done a Triangle class that way yet. That'd be fun to do. Nor a Tetrahedron, in any generic way, though I have some components lying around. :-D Having only one dimension change at a time, leaving others free to co-vary, makes for a good study in ripple effects. I've recently co-developed, with David Koski, another specimen of geometric object with co-varying properties. It's called a TetraBook and visually consists of a triangular book meaning both front and back covers are equilateral triangles, all edges 2, with a shared hinge (the book's spine). Imagine this book flat open on its back, with a single triangular page wagging back and forth, another equilateral triangle of edges 2. When it's all the way to one side, flat against either cover, there's no volume to speak of. When the page turns, however, the segments from page tip to each cover tip define two complementary tetrahedrons, the turning page their common face. What the TetraBook instance is allows is I can assign any of five attributes and, thanks to property methods behind the scenes, the other four with co-vary. The angle of the page, the lengths of the tip-to-tip segments, the volumes of the complementary tetrahedrons (same), their altitudes (same). I can even assign volume in two different ways, depending on what I consider my unit of volume (regular tetrahedron or right tetrahedron, the latter corresponding to a cube volume of edges 1). On Github: https://github.com/4dsolutions/Python5/blob/master/tetrabook.py (has a couple dependencies, also there: qrays.py and tetravolume.py) I recommend this approach to other math teachers. If your school also has a computer science department, so much the better right? Kirby lambda calc track oregon curriculum network 4dsolutions.net/ocn https://www.youtube.com/channel/UCr7TZxfhsqbeiQzLnHdgPgA
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