This is an introductory lesson for angles and triangles. This lesson highlights Right, acute and obtuse angles; and connects the angles to the right, acute and obtuse TRIangles. This lesson also includes equilateral and isosceles triangles. Students can review by playing a drag and drop matching game.
I used this with my second graders as an introductory lesson and had students draw examples of the angles and triangles on personal whiteboards.