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 181
iangles ABC, ABC be considered fixed, the fixed straight 152 EXERCISES OX EUCLID [187, line CC wifl always pass through the vertex C of any variabletriangle of the system. This fixed straight line is therefore therequired locus. 187. Any quadrilateral is divided by a straight lineinto two others;… … opposite sides. (This straight line is not drawn, in order not tocomplicate the figure.) Let the diagonals of the three quadrilaterals intersect in F, 0,Q ; then shall F, 0, Q be in a straight line. Join FO, OQ, FO,OF. The transversals DB and CA cut the rays of the pencil withvertex F in the points…
Geometry
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