Elements of Geometry and Trigonometry: With Notes |
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Page 127
... solution might suit every possible case . Scholium . A question may arise , whether , if any three angles be assumed at pleasure , a solid angle can be formed with them . Now , first , the sum of the three given angles must be less than ...
... solution might suit every possible case . Scholium . A question may arise , whether , if any three angles be assumed at pleasure , a solid angle can be formed with them . Now , first , the sum of the three given angles must be less than ...
Page 145
... solutions of which such problems are susceptible have , however , long since been discovered ; and though less simple than the constructions of elementary geometry , they are not , on that account , less rigorous or less satisfactory ...
... solutions of which such problems are susceptible have , however , long since been discovered ; and though less simple than the constructions of elementary geometry , they are not , on that account , less rigorous or less satisfactory ...
Page 175
... solution of them , or the determination of their parts , is al- ways reducible to the solution of such triangles as are compre- hended by the Definition . Indeed , it is evident enough , that if the sides and angles of the triangle ABC ...
... solution of them , or the determination of their parts , is al- ways reducible to the solution of such triangles as are compre- hended by the Definition . Indeed , it is evident enough , that if the sides and angles of the triangle ABC ...
Page 191
... solution of our Problem presents no farther difficulty , and may be effected thus : One face of the polyedron being given , describe that face ; and let CD be its apothem . Find , by the last Problem , the inclination of two adjacent ...
... solution of our Problem presents no farther difficulty , and may be effected thus : One face of the polyedron being given , describe that face ; and let CD be its apothem . Find , by the last Problem , the inclination of two adjacent ...
Page 211
... solution appears to include the sup- position that AB produced will meet the axis ; but the results would be equally true , though AB were parallel to the axis . Thus , the cylinder described by AMNB is equal to . AM2.MN ; the cone ...
... solution appears to include the sup- position that AB produced will meet the axis ; but the results would be equally true , though AB were parallel to the axis . Thus , the cylinder described by AMNB is equal to . AM2.MN ; the cone ...
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Elements of Geometry and Trigonometry from the Works of A. M. Legendre A. M. Legendre No preview available - 2017 |
Common terms and phrases
AC² adjacent adjacent angles altitude angle ACB angle BAC centre chord circ circle circular sector circumference circumscribed common cone consequently construction continued fraction convex surface cos² cosine cylinder demonstration determined diagonal diameter draw drawn equal angles equation equivalent faces figure formulas frustum greater homologous sides hypotenuse inclination inscribed intersection isosceles join less likewise manner measure multiplied number of sides opposite parallel parallelepipedon parallelogram perpendicular plane MN polyedron prism PROBLEM Prop PROPOSITION quadrilateral quantities radii radius ratio rectangle rectilineal triangle regular polygon right angles right-angled triangle SABC Scholium sector segment shew shewn side BC similar sin² sines solid angle sphere spherical polygon spherical triangle square straight line suppose tang tangent THEOREM third side three angles three plane angles triangle ABC triangular pyramids vertex vertices
Popular passages
Page 152 - AMB be a section, made by a plane, in the sphere, whose centre is C. From the...
Page 24 - THEOREM. In the same circle, or in equal circles, equal arcs are subtended by equal chords ; and, conversely, equal chords subtend equal arcs.
Page 22 - CIRCLE is a plane figure bounded by a curved line, all the points of which are equally distant from a point within called the centre; as the figure ADB E.
Page 62 - Similar triangles are to each other as the squares of their homologous sides.
Page 211 - If two angles of one triangle are equal to two angles of another triangle, the third angles are equal, and the triangles are mutually equiangular.
Page 187 - Similar cylinders are to each other as the cubes of their altitudes, or as the cubes of the diameters of their bases.
Page 140 - AT into equal parts .Ax, xy, yz, &c., each less than Aa, and let k be one of those parts : through the points of division pass planes parallel to the plane of the bases : the corresponding sections formed by these planes in the two pyramids will be respectively equivalent, namely, DEF to def, GHI to ghi, &c.
Page 150 - The radius of a sphere is a straight line, drawn from the centre to any point...
Page 168 - THEOREM. The surface of a spherical triangle is measured by the excess of the sum of its three angles above two right angles, multiplied by the tri-rectangular triangle.
Page 135 - XII.) ; in like manner, the two solids AQ, AK, having the same base, AOLE, are to each other as their altitudes AD, A M.