1. Intro To Angles

2. Do You Know? Complementary angles Vertex Protractor
Supplementary Angles
Reflex Angles
Opposite angles
Adjacent Angles
Bisect
Congruent
Symmetry
Vertex
Protractor
Rays
Degrees
Acute angle
Obtuse angle
Right angle
Straight angle

13. Complementary Angles The two angles must measure 900
The missing angle measure is 300
600 A

14. The missing angle measure is 500
Complementary Angles
The two angles must
total
900
The missing angle measure is 500
400 A

15. The missing angle measure is 680
Complementary Angles
The missing angle measure is 680
The two angles must
total
900 A
220

16. The missing angle measure is 1300
Supplementary Angles
The two angles must
total
1800
The missing angle measure is 1300 A
500

17. The missing angle measure is 950
Supplementary Angles
The missing angle measure is 950
The two angles must
total
1800 A
850

18. The missing angle measure is 1100
The two angles must
total
1800
The missing angle measure is 1100
700 A

19. Are These Angles Complementary?
Are they adjacent angles?
230
670

20. Are These Angles Complementary?
670
Are they adjacent angles?
230

21. Are These Angles Adjacent?3 2 1

22. Words You Should Know
Congruent Figures are figures that have the same shape and size.
Example:
Symmetry is a line of reflection that divides a shape into two equal parts.

23. < a is adjacent to < b
Adjacent Angles
Adjacent angles share a common vertex, a common ray, and the interior of one does not overlap the interior of the other.
< a is adjacent to < b a b

24. Bisect Bisect means to divide any figure into two equal parts.
Example:
300
300

25. Survivors The class has been stranded on a island.
To survive you must find a way for all group members to leave the island.
Your only tools are a survival kit provided by your teacher.

26. How To Get Off
The only way off the island it to follow the path created by a bisected right angle.
The only problem is, for each group member, the path must be created in a different way.
When you create a path off the Island write an explanation that explains the path.
Make sure all group member understand and agree that this method will actually work.
If all group members get off the island there will be a reward waiting.
Work together and GOOD LUCK!

27. Creating Angle Bisectors Assignment
For homework construct and bisect right angles. Each angle must be bisected using a different method. Write an paragraph for each angle identifying the tool(s) used and explaining how it was bisected.
This assignment will be marked for points:
Neatness and organization is a must
No more that 3 methods per page
C = 6 B = 8 A = 10

28. Example
The tool I use to bisect this angle was a protractor. I bisected the angle by placing the protractor on the vertex and along one ray. I followed the inside measure from 00 to 450 , made a made and then connected this mark back to the vertex of the angle.
450
450