


Challenge 


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?


