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 Challenge
 Protractor:  A measuring device that can be used to approximate the measure of an angle.

Slopes and Angles of Elevation: Determine the relationship between the slope of a line and the angle the line makes with a horizontal line.

Sum of Angles in a Polygon: Explore the relationship between the number of sides of a polygon and the sum of its interior angles.

Twice Reflected over Intersecting Lines: Find an equation that relates the angles formed by intersecting lines and points reflected over these lines.

Angles in a Circle: Investigate how the location of an angle's vertex affects its relationship to the measure(s) of the arc(s) it intercepts.