Comments on: Geometry – Day 58 – Area II & Area Applications

By: dan

dan — Fri, 23 Feb 2007 02:51:33 +0000

Oh, ten-four. I see your point. I’ve gotta figure out a graceful way to change that on the concept checklists.

By: e

Fri, 23 Feb 2007 02:33:55 +0000

Hmm, I agree that transformations and translations are both valid names, but not for the same thing. All translations are transformations, but not all transformations are translations. As you pointed out above, isometries (rigid transformations as you called them) consist of translations, reflections and rotations. The one in b) on the quiz is a reflection about the y-axis.

By: dan

dan — Thu, 22 Feb 2007 20:31:58 +0000

Transformations, according to Keypress, include translations, rotations, and reflections. “Transformations” and “translations” have been used perhaps too-interchangeably in my slides, but both are valid. Thanks for pointing them out, in any case. Gotta watch my P’s and Q’s around you, E.

By: e

Thu, 22 Feb 2007 17:53:27 +0000

Both in opener and the quiz in b) you say translation when I am fairly certain that you mean transformation. Since you’ve given this test already, it’d be interesting to know how many students realized that b) in fact was not a translation.