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 STANDARD G.CO.C.10 GEO Prove theorems about triangles. Theorems include: measures of interior angles of a triangle sum to 180°; base angles of isosceles triangles are congruent; the segment joining midpoints of two sides of a triangle is parallel to the third side and half the length; the medians of a triangle meet at a point. WORKSHEETS Regents-Interior and Exterior Angles of Triangles 1a GEO/GE/A MC 3/11/6 Regents-Interior and Exterior Angles of Triangles 1b GEO/GE/A bimodal Regents-Interior and Exterior Angles of Triangles 2 GE/A 4/2 Regents-Exterior Angle Theorem 1 GEO/GE 1/14 Regents-Exterior Angle Theorem 2 A 9 Regents-Triangle Inequality Theorem GE/A/B 8/10/1 Regents-Angle Side Relationship GE/A 17/1 Regents-Midsegments GEO/GE 2/16 Regents-Triangle Proofs GEO/GE 4/1 Regents-Medians, Altitudes and Bisectors GE/B 3/1 Regents-Centroid, Orthocenter, Incenter and Circumcenter GE 24 Practice-Interior and Exterior Angles of Triangles 1 10 Practice-Interior and Exterior Angles of Triangles 2 6 Practice-Exterior Angle Theorem 6 Practice-Triangle Inequality Theorem 10 Practice-Angle Side Relationship 6 Practice-Midsegments 10 Practice-Triangle Proofs 2 Practice-Centroid, Orthocenter, Incenter and Circumcenter 3 Journal-Interior and Exterior Angles of Triangles 5 Journal-Midsegments 2 VIDEOS Applying the Triangle Angle-Sum Theorem VID Applying the Triangle Exterior Angle Theorem Using the Triangle Midsegment Theorem VID Using the Triangle Midsegment Theorem to measure indirectly Applying properties of isosceles triangles VID Using inequalities involving sides of triangles VID Using inequalities involving angles of triangles Finding the lengths of medians VID Using concurrent lines

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