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 Center of a Circle:  The point inside the circle that is the same distance from all of the points on the circle.

Four Dogs: Explore the paths of four dogs, each of which starts at a different vertex of a square.

Equation of a Circle: Find the equation of a circle based on its radius, center, and locus of points.

Grazing for Mooey: How many square meters of grazing ground does Mooey the Cow have?