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.