1. A Triangle’s Angles What’s the sum? 11/9/09

2. Review Warm up Keep glue sticks for later.

3. Review What do we use a protractor for? How do we use it?

4. Review Complementary angles? Supplementary angles?

5. Review Complete Complementary & Supplementary Angles WS

6. EQ: What is the sum of the interior angles of a triangle?

7. How many degrees are in the three angles of a triangle? 180 How can we know for sure?

8. How many degrees -straight angle? 180 What kind of angle can we make with the triangle corners?

9. Hand out triangles. Tear off corners Glue triangle leftover into notebook.

10. Place angles into a straight angle and glue down. What kind of angle did we all make?

11. Hand out green cards and Triangle Pattern record sheet w/ protractors. Each pair will share a pack of triangles.

12. Measure the angles of one triangle together. What is the sum of the angles?

13. Carefully measure and record the angle measurement for each angle. Then find the sum. Use calculators.

14. What might account for differences in angle measurements?

15. EQ: What is the sum of the interior angles of a triangle?

16. Homework: Missing angles on “How did the judge find out about the rotten milk?”