**Title:** Math Makes a Connection: Exploring Angle Sums

**Description:**
In this interactive game, students will explore the sum of the measures of the interior angles of triangles, quadrilaterals, and other polygons using rotations of 180 degrees about a midpoint of a side. This game is part of the Connected Math site.

**Standard(s): **

[MA2013] (8) 20: Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angle-angle criterion for similarity of triangles. [8-G5]

[MA2013] (7) 12: Draw (freehand, with ruler and protractor, and with technology) geometric shapes with given conditions. Focus on constructing triangles from three measures of angles or sides, noticing when the conditions determine a unique triangle, more than one triangle, or no triangle. [7-G2]