52 VI. ON PARALLELOGRAMS. ON TRANSLATIONS
Translations.
Exercise 31. Find the locus of the points such that the sum or difference of
its distances to two given lines is equal to a given length.
Exercise 32. Given two parallel lines, and two points A, B outside these two
parallels, and on different sides, what is the shortest broken line joining the two
points, so that the portion contained between the two parallels has a given direction?
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