Lesson: Angle Sum Theorem and Exterior Angle Theorem
Lesson Objective
Lesson Plan
Activity 1: Warmup Questions.
3x+4=7x1 2(x+5)= 10 3x+1+4x3=180
Activity 2: Go over homework questions.
Activity 3: Anticipatory Set
Using Sketchpad or some other geometric computer program have the students complete the activity that has the student self discover the Triangle Sum Theorem (180 degrees in every triangle) and the Exterior Angle Theorem (the sum of the 2 remote interior angles equal the exterior angle). If no computer program is handy, using paper and protractor will provide the same results.
Activity 4: Fill out foyer notes.
Activity 5: Have students do the exit ticket by using the Boss/Secretary style of cooperative learning. One person tells how to do the problem, the other student writes it down. Switch rolls.
Activity 6: HomeworkPrinted out screen shot showing full star and proficiency.
http://www.khanacademy.org/math/geometry/congruenttriangles/isoscleles_equil/e/triangle_angles_1
Materials Needed:
Computers
Sketchpad Activity
Foyer Notes
Exit Ticket
Lesson Resources
Foyer notes.docx 
304

Exit Ticket.docx 
203

Sketchpad Lab.docx 
162

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