triangles, quadrilaterals

1. Find the missing angle!11/16/09 EQ: How do I find the missing angle in a triangle or quadrilateral?

2. Review: Go over assignment

3. Review: Acute angle: An angle less than 90 degrees

4. Review: Right angle: An angle exactly 90 degrees

5. Review: Obtuse angle: An angle greater than 90 degrees

6. Review: Straight angle: An angle exactly 180 degrees

7. Review: Complementary angles: 2 angles equal 90 degrees

8. Review: Supplementary angles: 2 angles equal 180 degrees

9. Review: Interior angles in a triangle equal: 180 degrees

10. Review: Equilateral Triangle: All sides same All Angles same

11. Review: Isosceles Triangle: Two sides same Two Angles same

12. Review: Scalene Triangle: No sides same No Angles same

13. Review: Interior angles in a quadrilateral equal: 360 degrees

14. If you are given 2 angles in a triangle, how do you find the third one?

15. <A + <B + <C = 180 So 180 - <A - <B = <C

16. Find the missing angle measure:

17. 52 + 48 = 100 180 – 100 = 80

18. Find the missing angle measure:

19. 60 + 40 = 100 180 – 100 = 80

20. Find the missing angle measure:

21. 35 + 70 = 105 180 – 105 = 75

22. One angle on a right triangle is 40o. What is the 3rd <? 50

23. What is the measure of each angle in equilateral triangles? 60

24. Do problems 1 & 2 on Find the Missing Angle.

25. If you are given 3 angles in a quadrilateral, how do you find the fourth one?

26. <A + <B + <C + <D = 360 So 360 - <A - <B - <C = <D

27. Find the missing angle measure:

28. 80 + 80 + 100 = 260 360 – 260 = 100

29. Find the missing angle measure:

30. 75 + 95 + 105 = 275 360 – 275 = 85

31. Find the missing angle measure:

32. 100 + 80 + 130 = 310 360 – 310 = 50

33. Find the missing angle measure:

34. Complete problems 3 & 4 on Find the Missing Angle.

35. Questions? Complete problem solving cards.

36. 90 + 90 + 45 = 225 360 – 225 = 135

37. EQ: How do I find the missing angle in a triangle or quadrilateral?