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locus of equidistant points

Source: Spanish Mathematical Olympiad 1982 P8

December 23, 2022
analytic geometrygeometryLocus

Problem Statement

Given a set CC of points in the plane, it is called the distance of a point PP from the plane to the set CC at the smallest of the distances from PP to each of the points of CC. Let the sets be C={A,B}C = \{A,B\}, with A=(1,0)A = (1, 0) and B=(2,0)B = (2, 0); and C={A,B}C'= \{A',B'\} with A=(0,1)A' = (0, 1) and B=(0,7)B' = (0, 7), in an orthogonal reference system. Find and draw the set MM of points in the plane that are equidistant from CC and CC' . Study whether the function whose graph is the set MM previously obtained is derivable.