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min length from (8, 2) to (5, 11) under conditions

Source: Spanish Mathematical Olympiad 1973 P7

December 23, 2022
analytic geometrygeometryinequalitiesGeometric Inequalities

Problem Statement

The two points P(8,2)P(8, 2) and Q(5,11)Q(5, 11) are considered in the plane. A mobile moves from PP to QQ according to a path that has to fulfill the following conditions: The moving part of P P and arrives at a point on the xx-axis, along which it travels a segment of length 11, then it departs from this axis and goes towards a point on the yy axis, on which travels a segment of length 22, separates from the yy axis finally and goes towards the point QQ. Among all the possible paths, determine the one with the minimum length, thus like this same length.