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1 Lesson Plan #20 Date: Friday October 17th, 2014 Class: Geometry Topic: Proving triangles congruent by the S.S.S. postulate. Aim: How do we prove triangles congruent by the S.S.S postulate? HW #20: Page 124 Written Exercises #’s 1-8 Objectives: 1) Students will be able prove triangles congruent using the S.S.S. postulate Do Now: 1) 2) Statements PROCEDURE: Write the Aim and Do Now Get students working! Take attendance Give Back HW Collect HW Go over the Do Now Assignment: Copy the triangle shown 1) Construct a side congruent to . Call it . 2) Use your compass to measure . Using that measurement put your compass point on D and draw a circle. 3) Use your compass to measure . Using that measurement put your compass point on E and draw a circle. 4) Name the intersection of the circles F forming DEF. 5) With your protractor, measure angles A, B, and C and compare to angles D, E, F, respectively. What do you notice? If all six corresponding parts are congruent, what can we say about the two triangles? Reasons 2 http://www.mathopenref.com/congruentsss.html Postulate: Two triangles are congruent if the three sides of one triangle are congruent respectively to the three sides of the other triangle [s.s.s.s.s.s.] 3 Sample Test Questions: 1) 6) 2) 7) 3) 4) 8) 5) 9) 4 10) 11) 12) 13) 14)