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1 Lesson Plan #019 Date: Tuesday October 25th, 2016 Class: Geometry Topic: Proving triangles congruent by the A.S.A postulate Aim: How do we prove triangles congruent by the A.S.A postulate? HW #019: Objectives: 1) Students will be able prove triangles congruent using the A.S.A. postulate Do Now: Statements Assignment #1: Construct two triangles by constructing a copy of the line segment below and constructing a copy of one angle on one endpoint of the line segment and a copy of the other angle at the other endpoint. PROCEDURE: Write the Aim and Do Now Get students working! Take attendance Give Back HW Collect HW Go over the Do Now Reasons 2 Let’s explore pairs of triangles that have two corresponding angles congruent and the included side congruent. Online Activity: http://www.mathopenref.com/congruentasa.html Postulate: Two triangles are congruent if two angles and the included side of one triangle are congruent respectively to two angles and the included side of the other [a.s.a. a.s.a] Statements Reasons 3 Sample Test Questions: 1) Based on the figure at right, how would you prove the two triangles congruent? 4 Final Summary: http://www.virtualnerd.com/tutorials/?id=Geo_04_02_0002 Sample Test Questions: 1) 5) 2) 6) 3) 7) 4)