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 87
reforeBF is a tangent to the circle circumscribing the triangle FG1L(III. 32). Therefore (III. 36) HB . BG equals the square on BF, that is,the square on half the difference of the sides. 87. The rectangle under the distances of the points inwhich the bisector of the external vertical angle of a… … base* AG the bisector of the external vertical angle CAE, and Bthe middle point of the base. 89.] AND IN MODERN GEOMETRY 59 Join DF, HF, and produce DF to K. It is proved in (24)that DF is parallel to AB and equal to half the sum of the sidesAB, AC. Because DF and BE are parallel, the angles DFA or…
Geometry
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