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 203
For if Pf be placed upon P so that FA shall fall upon PA,FF upon PB, and PC upon PC, then PD must fall upon PDor its production PD \ for if possible, let PD take the positionPE, and draw the transversal AE. Since {P. ABCD} = {P. ABCE] (hyp.), therefore AD. BC : AB. CD :: AE. BC : AB.CE, or,…
Geometry
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