Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 45
44 G E O M E T RY. Of the Cir … THEOREM V. A line which is perpendicular to a radius at its extremity, istangent to the circle. Lot the line ABD be perpendicularto the radius CB at the extremity B :then will it be tangent to the circle atthe point B. For, from any other point of theline, as D, draw DFC to the centre,cutting the…
Geometry · Plane trigonometry
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