Ball, W. W. Rouse (Walter William Rouse), 1850-1925 · London, Macmillan · leaf 340
of the proofsgiven by Legendre*. A triangle ABG is completely deter-mined by one side and two angles, say, a, B, G. Given these,the triangle can be constructed, and therefore the angle A de-termined. Now if the unit of length be changed the measure • Elements de Geometrie, Paris, 12th edition, p.… … Now take a right-angled triangle DEF, of which D is theright angle. Draw DG perpendicular to EF. The angle EDGin the triangle EBG is calculated from the other two angles ofthat triangle, namely E and a right angle, in the same wayas the angle F in the triangle DEF is calculated from theother two…
Geometry · Cryptography · Ciphers
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