Ball, W. W. Rouse (Walter William Rouse), 1850-1925 · London, Macmillan · leaf 67
isects DA and is perpendicular to it, wehave the angle ODA equal to the angle OAD. Hence the angle ADC (which is the difference of ODC andODA) is equal to the angle DAE (which is the difference ofOAE and OAD). But ADC is a right angle, and DAE isnecessarily greater than a right angle. Thus the… … acute, and that the angle A is greater than the angle G. FromA draw AD making the angle BAD equal to the angle (7, andcutting BG in D. From A draw AE perpendicular to BG. The triangles ABG, ABD are equiangular; hence, by Euc.VI. 19, /SABG : IS ABD = AG : AD\ Also the triangles ABG, ABD are of equal…
Geometry · Cryptography · Ciphers
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