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 211
a semicircle. 4. Prove that points X, Y, Z, etc. bisect the arcs BXO, AXO,BYO,CYO, etc. 5. Prove that (1) OX=OY = OZ, etc., and (2) arcs AX,XB, BY,etc. are equal. 6. Prove that chords joining every third point of division passthrough two intersections. Suggestion. —Prove that AF passes through… … Fig. 179. — From Defsnbach, Ser es B,PI. VIM.
Geometry · Decoration and ornament
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