Perspective and geometrical drawing adapted to the use of candidates for second and third-class teachers' certificates . Fig. 75. Let ABC be the given right angle; with B as centre andat any distance BA describe the quadrant AC; with centre Aand distance equal to AB describe an arc to cut AC in E; andwith centre C, and distance equal to CB or BA describe an GEOMETRICAL DRAWING. Ill arc to cut arc in D. Then D, E will be points of trisection,and lines from D and E to B will trisect the angle. (Eig, 75.)J\^o. 8.—To inscribe a circle in a given Let ABO be the given triangle; bisect the
Perspective and geometrical drawing adapted to the use of candidates for second and third-class teachers' certificates . Fig. 75. Let ABC be the given right angle; with B as centre andat any distance BA describe the quadrant AC; with centre Aand distance equal to AB describe an arc to cut AC in E; andwith centre C, and distance equal to CB or BA describe an GEOMETRICAL DRAWING. Ill arc to cut arc in D. Then D, E will be points of trisection,and lines from D and E to B will trisect the angle. (Eig, 75.)J\^o. 8.—To inscribe a circle in a given Let ABO be the given triangle; bisect the angle at A byAD, and the angle at B by BD, cutting AD in D; draw DEperpendicular to AB at point E; then with centre D anddistance DE describe the circle. (Eig. 76.) No, 9,—To draw a circle through three given points, which,however, cannot be in the same straight line.
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Keywords: ., bookcentury1800, booksubjectgeometricald, booksubjectperspective
