Geometry Cheat Sheets

Good resource. Thank you.

The terminology used in this resource is sloppy. Perpendicular lines are lines in the same plane that intersect with four 90-degree angles? ANY two lines that intersect must be in the same plane, so why is that part of the definition of perpendicular? The so-called "ends" of prisms should be referred to as "bases." Secants are LINES that contain chords, not rays or segments that contain chords. Vertical angles aren't equal; their MEASURES are equal (or the angles themselves are CONGRUENT). Measures of obtuse angles are between 90 degrees and 180 degrees, not just larger than 90 degrees. (Otherwise, straight angles and reflex angles could also be called obtuse.) Claiming simply that the "sum of the measures of supplementary angles is 180 degrees" leaves out the fact that only a PAIR of angles can have a supplementary relationship. I know I'm being particularly picky on that last one, but if I'm going to give students something to study from, I want it to contain complete, accurate definitions. This definition leaves open the possibility that three or more angles could be supplementary. There are other examples of sloppy terminology, too, but I think I've given potential buyers a sense of what they're purchasing. I can't recommend this resource, since I'm not comfortable giving these cheat sheets to my students as study tools, in-class practice assignments, or formative assessments. I wish I could get my $16 investment back.

Great resource!

VERY HELPFUL!! Thank you!

I really like the layout and creativity

Saved me time - students used it to prepare for the state exam - I had my students look for additional definitions and write them on the handout and then write a definition they, as a class, was comfortable using.

Thank you

Great tool for my inclusion students, and for me!