GEOM.2B: Make conjectures about angles, lines, polygons, circles, and three-dimensional figures and determine the validity of the conjectures, choosing from a variety of approaches such as coordinate, transformational, or axiomatic
GEOM.5B: Analyze numeric and geometric patterns to make generalizations about geometric properties, including properties of polygons, ratios in similar figures and solids, and angle relationships in polygons and
Students apply and make conjectures about triangle properties.
Notes on page 75 of the IMN
Reviews classification of Triangles and the Triangle Sum Theorem and the Exterior Angle Theorem