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# 2.8 Find The Missing Angle!

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### 2.8 Find The Missing Angle!

1. 1. Find the missing angle!11/16/09<br />EQ: How do I find the missing angle in a triangle or quadrilateral?<br />
2. 2. Review:<br />Go over assignment<br />
3. 3. Review:<br />Acute angle:<br />An angle less than 90 degrees<br />
4. 4. Review:<br />Right angle:<br />An angle exactly 90 degrees<br />
5. 5. Review:<br />Obtuse angle:<br />An angle greater than 90 degrees<br />
6. 6. Review:<br />Straight angle:<br />An angle exactly 180 degrees<br />
7. 7. Review:<br />Complementary angles:<br />2 angles equal 90 degrees<br />
8. 8. Review:<br />Supplementary angles:<br />2 angles equal 180 degrees<br />
9. 9. Review:<br />Interior angles in a triangle equal:<br />180 degrees<br />
10. 10. Review:<br />Equilateral Triangle:<br />All sides same<br />All Angles same<br />
11. 11. Review:<br />Isosceles Triangle:<br />Two sides same<br />Two Angles same<br />
12. 12. Review:<br />Scalene Triangle:<br />No sides same<br />No Angles same<br />
13. 13. Review:<br />Interior angles in a quadrilateral equal:<br />360 degrees<br />
14. 14. If you are given 2 angles in a triangle, how do you find the third one?<br />
15. 15. &lt;A + &lt;B + &lt;C = 180<br />So <br />180 - &lt;A - &lt;B = &lt;C<br />
16. 16. Find the missing angle measure:<br />
17. 17. 52 + 48 =<br />100<br />180 – 100 = 80<br />
18. 18. Find the missing angle measure:<br />
19. 19. 60 + 40 =<br />100<br />180 – 100 = 80<br />
20. 20. Find the missing angle measure:<br />
21. 21. 35 + 70 =<br />105<br />180 – 105 = 75<br />
22. 22. One angle on a right triangle is 40o.<br />What is the 3rd &lt;? <br />50<br />
23. 23. What is the measure of each angle in equilateral triangles?<br />60<br />
24. 24. Do problems 1 & 2 on Find the Missing Angle.<br />
25. 25. If you are given 3 angles in a quadrilateral, how do you find the fourth one?<br />
26. 26. &lt;A + &lt;B + &lt;C + &lt;D = 360<br />So <br />360 - &lt;A - &lt;B - &lt;C = &lt;D<br />
27. 27. Find the missing angle measure:<br />
28. 28. 80 + 80 + 100 =<br />260<br />360 – 260 = 100<br />
29. 29. Find the missing angle measure:<br />
30. 30. 75 + 95 + 105 =<br />275<br />360 – 275 = 85<br />
31. 31. Find the missing angle measure:<br />
32. 32. 100 + 80 + 130 =<br />310<br />360 – 310 = 50<br />
33. 33. Find the missing angle measure:<br />
34. 34. Complete problems 3 & 4 on Find the Missing Angle.<br />
35. 35. Questions?<br />Complete problem solving cards.<br />
36. 36. 90 + 90 + 45 =<br />225<br />360 – 225 = 135<br />
37. 37. EQ:<br />How do I find the missing angle in a triangle or quadrilateral?<br />