Circles With Angles Formed by Secants and Tangents
Illustration showing angles formed by two secants, two tangents, or a tangent and a secant, drawn to a circle form an external point. The angle is measured by half the difference of the intercepted arcs.
Keywordscircle, circles, tangent, angle, angles, arcs, external point, secant, secants, tangents, intercepted arc
G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 106