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 174
Fig. 139. Fig. 139a. — From South Park Con-gregational Church, Chicago. 172. In Fig. 139 the circumference of the circle is divided into three equalparts by the points A, B, and C. the trefoil ATBSC etc. is composed ofsemicircles tangent to the circle at points A, B, and C. EXERCISES 1. Show how to…
Geometry · Decoration and ornament
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