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 243
Fig. 208a. —From Lichfield Cathedral. 252. In Fig. 208 ABC is an equilateral curved triangle with A, B, and Cas centers for the sides. AF, BE, and CD are the medians of the linearA ABC, extended to the arcs as indicated. The circles O, O, and O are tan-gent to each other and to the sides of the…
Geometry · Decoration and ornament
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