ELEMENTS OF GEOMETRY AND TRIGONOMETRY

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Pagina 24 - If two triangles have two sides and the included angle of the one, equal to two sides and the included angle of the other, each to each, the two triangles will be equal.
Pagina 38 - That, if a straight line falling on two straight lines make the interior angles on the same side less than two right angles, the two straight lines, if produced indefinitely, meet on that side on which are the angles less than the two right angles.
Pagina 227 - A spherical triangle is a portion of the surface of a sphere, bounded by three arcs of great circles.
Pagina 271 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees...
Pagina 43 - Hence, the interior angles plus four right angles, is equal to twice as many right angles as the polygon has sides, and consequently, equal to the sum of the interior angles plus the sum of the exterior angles.
Pagina 215 - The surface of a sphere is equal to the product of its diameter by the circumference of a great circle.
Pagina 107 - If two triangles have two angles of the one equal to two angles of the other, each to each, and also one side of the one equal to the corresponding side of the other, the triangles are congruent.
Pagina 93 - The area of a parallelogram is equal to the product of its base and altitude.
Pagina 231 - The angles of spherical triangles may be compared together, by means of the arcs of great circles described from their vertices as poles and included between their sides : hence it is easy to make an angle of this kind equal to a given angle.
Pagina 232 - F, be respectively poles of the sides BC, AC, AB. For, the point A being the pole of the arc EF, the distance AE is a 'quadrant ; the point C being the pole of the arc DE, the distance CE is likewise a quadrant : hence the point E is...

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