Angle Discovery

Materials:  Patty Paper (Wax Paper, Tissue Paper or Tracing Paper also work.)
	      Pen or Marker (permanent marker works best on wax paper)
                  A Straight Edge (ruler, index card, side of a protractor)

1.  Vertical Angle Property:   Vertical angles are congruent.

•	Draw two intersecting lines on a piece of patty paper.  
•	Label the angles 1, 2, 3, and 4.  

•	Fold the paper so that one pair of vertical angles lie over each other(fall on top of each other)

•	What do you notice about their measures?  
•	Fold the paper again so that the other pair of vertical angles lie over each other.

•	What do you notice about their measures?

2.  Linear Pair Property:  The angles that form a linear pair are supplementary.

•	Use the same drawing from part 1.
•	Which angles make up a linear pair?  

3.  Angles Formed by Perpendicular Lines:  If two lines are perpendicular, then they form four congruent, adjacent angles.
	
•	Fold a new piece of patty paper in half.

•	Fold it in half a second time.

•	 Number the angles with numbers 1, 2, 3, and 4.

•	Which angles are congruent?