Perspective and geometrical drawing adapted to the use of candidates for second and third-class teachers' certificates . ]Sfo, 20.—To construct a regular hexagon on a given Fig. 91. 122 DRAWING. Let AB be the given line; with centre A and distance ABdescribe arc; ^rith centre B and distance BA, describe arccutting at C; join CA, CB. With centre C and distance CA,describe circle cutting in D, B and A; join DC and produceto E; produce AC to G and BC to F; join AE, EF, FG,GD and DB, completing the hexagon. JTo. 21,—To construct a regular octagon {a) on a givenstrai^rht line. ( 5 H^
Perspective and geometrical drawing adapted to the use of candidates for second and third-class teachers' certificates . ]Sfo, 20.—To construct a regular hexagon on a given Fig. 91. 122 DRAWING. Let AB be the given line; with centre A and distance ABdescribe arc; ^rith centre B and distance BA, describe arccutting at C; join CA, CB. With centre C and distance CA,describe circle cutting in D, B and A; join DC and produceto E; produce AC to G and BC to F; join AE, EF, FG,GD and DB, completing the hexagon. JTo. 21,—To construct a regular octagon {a) on a givenstrai^rht line. ( 5 H^ / \ \ f / > 1 ?f \ H 7 c h L 0 Fi- 92, Let AB be the given line; produce it both ways, anddescribe the semicircles CKB and AMD. Erect a perpen-dicular at A and at B; bisect the right angles C AG and DBHby AK and BM, respectively, and erect perpendiculars KEand IMF, at K and ^I, respectively. With centre K and dis-tance KA describe arc EA cutting KE in E; draw similararc BF cutting MF in F; with centre E and distance EKdescribe arc to cut AG in G ; similarly find H; join EG, GHand HF, completing the octiigon. (Fig. 92.) (6) In a given square. Let BCDE be the given square; d
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Keywords: ., bookcentury1800, booksubjectgeometricald, booksubjectperspective
