Do You Know Vertex Protractor Rays Degrees Acute

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

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

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

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

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

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

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

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

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

Are These Angles Adjacent? 1 2 3

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. Example:

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 b < a is adjacent to < b

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

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.

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 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!

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

Example 450 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 and then connected this mark back to the vertex of the angle.