International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 52
SURVEYING. G41 2. Two tangents drawn to a circle from any point areequal, and if a chord be drawn joining these points, theangles between the chord and the tangents are equal. Thus,B E and C E are equal, and the angles E B C and E C Bare equal. 3. An acute angle between a tangent and a chord… … 4. An acute angle subtended by a chord, and having itsvertex in the circumference of a circle, is equal to half thecentral angle subtended by the same chord. Thus, theangle E B 6, whose vertex B is in the circumference andsubtended by the chord B G, is equal to half the centralangle BOG, subtended…
Railroad engineering
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