A source book of problems for geometry, based upon industrial design and architectural ornament (1912)
Sykes, Mabel, 1868-, Slaught, H. E. (Herbert Ellsworth), 1861-1937, Lennes, N. J. (Nels Johann), 1874- · Boston, Allyn and Bacon · leaf 234
D = OL, and the circle tangent to j4C at L. Prove OL = OM. (b) The method given in § 246. (c) The following special method.* Make PD = AB. With Pas center and DB as radius cut the arc AC at L. Draw LB cuttingCD at 0. Prove (1) ZPLB = rt.Z, using APLB and PDB;(2) OL = OD, using A PiO and ODB; (3) OL… … 242. Figures 199 and 199a represent circles inscribed in Gothic archeswhich are not equilateral. Figure 199 shows the lancet arch and Fig. 199a thedrop arch. In each case points H and K are the centers for the arcs BC andAC, respectively. EXERCISES 1. Show how to inscribe a circle in a lancet arch…
Geometry · Decoration and ornament
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