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

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