Elements of Geometry and Trigonometry: With Notes |
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Page 49
... multiplied by the number of linear units contained in D ; and it is easy to see that this product may , indeed must , be equal to that which results in a similar manner from the lines B and C. The magnitudes A and B may be of one ...
... multiplied by the number of linear units contained in D ; and it is easy to see that this product may , indeed must , be equal to that which results in a similar manner from the lines B and C. The magnitudes A and B may be of one ...
Page 52
... multiplied by the altitudes , so that we have ABCD : AEGF :: AB × AD : AEX AF . Having placed the two rectangles , H ... Multiplying the corresponding terms of those proportions to- gether , and observing that the mean term AEHD may be ...
... multiplied by the altitudes , so that we have ABCD : AEGF :: AB × AD : AEX AF . Having placed the two rectangles , H ... Multiplying the corresponding terms of those proportions to- gether , and observing that the mean term AEHD may be ...
Page 53
... multiplied by itself . The arithmetical squares of 1 , 2 , 3 , & c . are 1 , 4 , 9 , & c . So likewise the geometrical square constructed on a double line is evidently four times as great as on a single one ; on a triple line , is nine ...
... multiplied by itself . The arithmetical squares of 1 , 2 , 3 , & c . are 1 , 4 , 9 , & c . So likewise the geometrical square constructed on a double line is evidently four times as great as on a single one ; on a triple line , is nine ...
Page 54
... multiplied by the half sum of its parallel bases , AB , CD . Through I , the middle point of the side BC , draw KL parallel to the opposite side AD ; and produce DC till it meet KL . H In the triangles IBL , ICK , we have the side IB IC ...
... multiplied by the half sum of its parallel bases , AB , CD . Through I , the middle point of the side BC , draw KL parallel to the opposite side AD ; and produce DC till it meet KL . H In the triangles IBL , ICK , we have the side IB IC ...
Page 55
... multiplied by the line which connects the middle points of its unparallel sides . PROPOSITION VIII . THEOREM . If a line AC is divided into two parts AB , BC , the square described on the whole line AC , will include the square de ...
... multiplied by the line which connects the middle points of its unparallel sides . PROPOSITION VIII . THEOREM . If a line AC is divided into two parts AB , BC , the square described on the whole line AC , will include the square de ...
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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.