Elementary plane geometry : inductive and deductive / by Alfred Baker (1903)
Baker, Alfred, 1848-1942 · Toronto : Gage · leaf 83
Then AF and AG are the tangentsfrom A. For, the triangles ACF and DCB are equal. But theangle CBD is a right angle; therefore the angle CFAis a right angle, and AF is a tangent to the circle(Ch. X., 2). In the same way we may prove that AGis a tangent. Symmetry suggests that the tangents AF, AG… … 80 4^ Geometry. angles, therefore the triangles CDB, CEB are equal inall respects. But the triangle CAF is equal in allrespects to CDB; and the triangle CAG is equal in allrespects to the triangle CEB. Therefore the trianglesCAF and CAG are equal in all respects. Hence AF, AGare equal, and the…
Geometry, Plane
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