Download Geometry Fall 2011 Lesson 17 (S.A.S. Postulate)

1
Lesson Plan #019
Date: Friday October 12th, 2013
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:
PROCEDURE:
Write the Aim and Do Now
Get students working!
Take attendance
Give Back HW
Collect HW
Go over the Do Now
2
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]
If enough time:
http://www.mathwarehouse.com/geometry/congruent_triangles/angle-side-angle-postulate.php
3
Sample Test Questions:
1) Based on the figure at right, how would you prove the two triangles congruent?
2)
3)
4)
5)
6)
8)
7)
4
Group work: