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 75
(4) Eff = {LB){KB). (5) EL^=(KL)(LB). 6. Extend sides ^/C, /CS, BP, etc. until they intersect. Provethat the lines DT, BP, and DC are concurrent. Prove that a regularoctagon is formed. 7. Extend the sides EAf, MF, FR, etc. until they intersect. Provethat the lines GR, EM, and OF are concurrent.… … A E J3 Fig. 59. —MooriBh Design from Toledo. EXERCISES 1. Prove that the points E, Y, O, U, and G, and also B, Z, O, T, andD are collinear. Suggestion. —Fi-oveZYAB = ZYBA; AY=BY; G£ the perpen-dicular bisector of AB. Therefore Flies on EG. DESIGNS CONTAINING. STABS, ROSETTES, CROSSES 63 2. Prove…
Geometry · Decoration and ornament
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-112-294.webp)
