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 143
rig. 118. - Arabic Design Unit. Bourgoin {2), Vol. 7,II, Pis. 42 and 55. Fig. l|8a. — LinoleumDesign. 144. In Fig. 118 the drcumference is divided into 12 equal parts and thepoints joined as indicated. EXERCISES 1. Prove that (a) ABX, CDY, etc., are congruent equilateral triangles. (b) BCXY, EDYZ,…
Geometry · Decoration and ornament
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