Legendre, A. M. (Adrien Marie), 1752-1833, Brewster, David, Sir, 1781-1868, Davies, Charles, 1798-1876 · New York, Wiley & Long · leaf 238
1?D and give the pro- 25S PLANE TRIGONOMETRY. But we also have, CE : CFR : cos C C07^ : CB : CA : hence: CB : CA. If the radius R=l, we shall have, AB = CB sin C, and CA=CB cos C. Hence, in every right angled triangle, the perpendicular is equalto the hypothenuse mv.Hiplied hyihe siiie of the angle… … In every right angled triangle^ radius is to the tangent of ei-ther of the acute angles, as the side adjacent to the side op-posite. Let CAB be the proposed tri-angle. With any radius, as CD, de-scribe the arc DE, and draw thetangent DG. From the similar trianglesCDG, CAB, we shall have, CD : DG :…
Trigonometry · Geometry
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