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 139
e common triangle COD and thereremains the sum of the triangles AOB and BOO equal to the tri-angle BOD. q. e. d. 147. Given an indefinite straight line and two points onthe same side of it. Find a point in the line such that thestraight lines drawn from it to the two given points shall beequally… … F> r. AG. Join BF. meeting CD in F. Fh the required point. For,join AF. and join .1 and 7> with any other point 11 in CD, Theangles AFQ and GFJB are equal (I. 4), Therefore AFG and BFD are equal (I. 15). Also, AF and FB are together equal to FB,and All and 11B are together equal to Ell and…
Geometry
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