13Circumference and Area
What if a UFO landed one night on a beach, abducted a few midnight swimmers, and then took off? Suppose it left an imprint in the sand that measured 1,000 feet around. Just how big, then, was that UFO? If UFO had a circular base that measured 1,000 feet around, how wide was it?
In this chapter, we'll look at some of the same ideas as we did in the last chapter: measuring around the outside edge of a figure and measuring the area, or space inside the figure. This time, however, we'll be focused on circles, not rectangles or triangles. Circles don't have bases or heights or sides. They have no straight edges to measure, so we'll have to find some new ways to handle these questions. Along the way, we'll look at a very ...
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