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 229
Fig. 193. Fig. 1930. — From Church of Our Redeemer,St. Louis. 235. In Fig. 193 the trefoil ADBFC etc. is constructed from semicirclesdescribed on the sides of A ABC. The points D, E, and F are the centers forthe arcs which are tangent to the sides of A ABC and which form the tre-foil HYKZGX.…
Geometry · Decoration and ornament
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