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altitude angle BAD bisect centre chord circumference circumscribed column common comp cone consequently convex surface cosine Cotang cube cylinder decimal diagonal diameter difference distance divided draw drawn edges equations equivalent feet figure find the area four right angles frustum given angle given line given point gles greater hence homologous homologous sides horizontal hypothenuse included angle inscribed circle intersect less Let ABC let fall logarithm magnitudes measured by half middle point number of sides opposite parallel parallelogram parallelopipedon pendicular perimeter perpendicular plane MN polyedral angle polyedron PROBLEM proportional PROPOSITION pyramid quadrant quotient radii radius ratio rectangle regular polygon right angles right-angled triangle Scholium secant segment similar similar triangles sin2 sine slant height solidity sphere spherical triangle square described straight line subtracting Tang tangent THEOREM third three angles triangle ABC triangular prism triedral angles Trigonometry vertex vertices
Side 227 - A spherical triangle is a portion of the surface of a sphere, bounded by three arcs of great circles.
Side 271 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees...
Side 278 - In any triangle, the sum of the two sides containing either angle, is to their difference, as the tangent of half the sum of the two other angles, to the tangent of half their difference.
Side 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.
Side 371 - O's, points or dots are introduced instead of the 0's through the rest of the line, to catch the eye, and to indicate that from thence the annexed first two figures of the Logarithm in the second column stand in the next lower line. N'.
Side 43 - BtSL hence the sum of all the interior and exterior angles, is equal to twice as many right angles as the polygon has sides.
Side 119 - The angle formed by a tangent and a chord is measured by half the intercepted arc.
Side 30 - B : hence the 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 : hence, the two triangles are equal (Th.