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 Pi:  The ratio of the circumference of a circle to its diameter.

Equal Areas: Construct a circle with five equal regions that do not intersect at the circle's center.

Changes in the Circumference: Explore how changing the diameter of a circle affects its circumference.

Area of a Sector: Determine the relationship between the area of a circle's sector and the radius and central angle of the circle, and between the arc length of a circle and the radius and central angle of the circle.