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 229
Fig. 3- angles ADE\ CDE, and BDE are isosceles, it is clear that ADand BD are parallel. Therefore, from the similar triangles ASDand BSD, we have AS : SB :: AD : BD, … Fig. 4. 231.] AND IN MODERN GEOMETRY. 201 and therefore a? is a centre of similitude of the two fixed circles (A)and (B). In Figs. 1 and 3, the contacts are of the same kind, and S is theexternal centre of similitude of (A) and (B). In Figs. 2 and 4, the contacts are of different hinds, and S isthe…
Geometry
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