Exercises on Euclid and in modern geometry for the use of schools, private students, and junior university students (1881)
McDowell, James L · Cambridge, Deighton, Bell, and Co. · leaf 99
BCO, therefore (52) thequadrilateral is circumscribable by acircle, and therefore the angles OA Cand OBC are equal (III. 21), but OBCis a given angle, therefore OAC isknown, and since OA and the point Aare fixed, therefore the locus of C is the fixed straight line AC. 105. Straight lines are drawn…
Geometry
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