Consider all points that are equidistant from the origin.
Which of following graphs represents this collection of points?
Consider the following.
Consider the circle in the graph.
Consider the graph of the circle shown below.
Give an informal argument, e.g., dissection arguments, Cavalieri's principle, or informal limit arguments, for the formulas for the circumference of a circle; area of a circle; volume of a cylinder, pyramid, and cone.