An elementary treatise on geometry : simplified for beginners not versed in algebra (1833)
Grund, Francis J. (Francis Joseph), 1805-1863 · Boston : Carter, Hendee & Co. · leaf 157
-ference of a circle. 3. Through the points E and D,where this circumference cuts thecircumference of the given circle, draw the lines AD,AE ; and they are tangents to the given circle. Demon. Join DC, EC. The angles x and y, being both an-gles at the circumference of the circle whose centre is B,… … GEOrETRY. 153 as many c^egrees as the serai-circumference (page 107, Rem. 3d);consequently, they are both right angles, and the lines AE andDA, being perpendicular to the radii CE, DC, are both tangentsto the cii-cle C. Remark. From a point without a circle, you can always drawtwo tangents to the…
Geometry, Plane
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
