# Types of Triangles and Angle Sum Theorems with Answer Key (Editable)

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Geometry students need practice with identifying and naming triangles (acute, scalene, isosceles, etc.) and they also need practice using the triangle sum theorem and exterior angle theorem.

Instead of "chalk-and-talk," I use this worksheet to help my students through these concepts in class, as they work together in cooperative groups. They should be able to discover the exterior angle theorem with your assistance if they complete the problems on this worksheet.

I have them do this worksheet with a copy of the text at each table, so you will need to modify the worksheet to match your textbook. I included specific information in the answer key to help you make these modifications.

This worksheet is designed so you can circulate around the room to make sure they're getting it. I like to use groups of 4 so that they may help one another, and then call me over for help.

I've included spiral review including proofs and constructions.

The preview file is a pdf so you may see exactly what you're getting; the product file is a word document, which you may edit to your liking.

DISCLAIMER: When students want to add three to both sides of an equation, I am admittedly sloppy in allowing them to write "+3" on both sides, and then writing the simplified equation underneath, and calling all of those steps "addition property of equality." Please feel free to modify the statements and reasons to fit what you feel is the most appropriate for your students.

Immediately before this worksheet, I use the worksheet named 'Playing Detective with y = mx + b (slope-intercept form) for Geometry Fall 2013' (http://www.teacherspayteachers.com/Product/Playing-Detective-with-y-mx-b-slope-intercept-form-for-Geometry-Fall-2013-1070820), and immediately after this worksheet, I use the worksheet named 'Proving Triangles Congruent By SSS Fall 2013' (http://www.teacherspayteachers.com/Product/Proving-Triangles-Congruent-By-SSS-Fall-2013-1072444)

Keywords: geometry, interior angle theorem, exterior angle theorem, remote interior angles, acute, scalene, isosceles, right, obtuse, equilateral, equiangular, Jonnard
Total Pages
4 pages
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Teaching Duration
1 hour
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\$4.49