 FOR PLANE AND SPHERICAL TRIANGLES. (47.) IF a rectilinear triangle be drawn through three points A, B, C, fixed in space, and if from the point where the perpendiculars bisecting the sides meet one another, a straight line be drawn perpendicular to the...  Elements of Spherical Trigonometry - Pàgina 25per Augustus De Morgan - 1833 - 32 pàginesVisualització completa - Sobre aquest llibre
 | 1835 - 684 pàgines
...of its arc to the radius (41) the area is •21a 2 (43). CHAPTER VI. CONNEXION BETWEEN THE FORMULA FOR PLANE AND SPHERICAL TRIANGLES. (47.) IF a rectilinear...points. Let us call this line the axis of the triangle. (48.) Any point О being taken in the axis for a centre, and the sphere being drawn, А, В, С, will... | |
 | Euclid, James Thomson - 1837 - 410 pàgines
...coincide exactly with the other.* If, however, through the point in which the perpendicular cuts the base, a straight line be drawn perpendicular to the plane of the triangle, and through any point of that perpendicular straight lines be drawn to the several angles, a pyramid... | |
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