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A parabola can be defined as the locus of points equidistant from a given point and a

given line. An ellipse can be defined as the locus of points, the sum of whose

distances to two given points is a constant. A hyperbola can be defined as the locus

of points, the difference of whose distances to two given points is a constant.

Construct one or all of these curves in Sketchpad based on these definitions.

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