Can you draw a unique triangle with the given information, or several different ones? We look at six different situations:

- an equilateral triangle (e.g. all angles 60 degrees)

- three angles are given

- two angles and a side between them are given

- two sides and an angle between them are given

- three sides are given

- three sides are given, but something special happens - we get no triangle!

I use a ruler, a protractor, and a compass to draw the triangles. Two of the situations are actually standard geometric constructions (equilateral triangle and a triangle with three given sides).

This lesson is meant for 7th grade math and matches the Common Core Standard 7.G.2.

Check out also my pre-algebra videos at http://www.mathmammoth.com/videos/prealgebra/pre-algebra-videos.php

Tagged under: 7.G.2,draw triangles,geometry,compass,protractor,equilateral triangle,triangle sides,triangle,geometric construction,7th grade,math

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