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# 2.5 A Triangle’S Angles

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### 2.5 A Triangle’S Angles

1. 1. A Triangle’s Angles<br />What’s the sum?<br />11/9/09<br />
2. 2. Review<br />Warm up<br />Keep glue sticks for later.<br />
3. 3. Review<br />What do we use a protractor for?<br />How do we use it?<br />
4. 4. Review<br />Complementary angles?<br />Supplementary angles?<br />
5. 5. Review<br />Complete Complementary & Supplementary Angles WS<br />
6. 6. EQ:<br />What is the sum of the interior angles of a triangle?<br />
7. 7. How many degrees are in the three angles of a triangle?<br />180<br />How can we know for sure?<br />
8. 8. How many degrees -straight angle?<br />180<br />What kind of angle can we make with the triangle corners?<br />
9. 9. Hand out triangles.<br />Tear off corners<br />Glue triangle leftover into notebook.<br />
10. 10. Place angles into a straight angle and glue down. <br />What kind of angle did we all make?<br />
11. 11. Hand out green cards and Triangle Pattern record sheet w/ protractors.<br />Each pair will share a pack of triangles. <br />
12. 12. Measure the angles of one triangle together.<br />What is the sum of the angles?<br />
13. 13. Carefully measure and record the angle measurement for each angle. <br />Then find the sum.<br />Use calculators. <br />
14. 14. What might account for differences in angle measurements?<br />
15. 15. EQ:<br />What is the sum of the interior angles of a triangle?<br />
16. 16. Homework:<br />Missing angles on “How did the judge find out about the rotten milk?”<br />