Elements of Geometry and Trigonometry: With Notes |
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Page 261
... tang tang , for both . r 3 We may observe , that the regular polyedrons are not the only solids contained by equal and regular polygons . If two regular tetra- edrons are adjusted to each other by a common face , a solid bounded by six ...
... tang tang , for both . r 3 We may observe , that the regular polyedrons are not the only solids contained by equal and regular polygons . If two regular tetra- edrons are adjusted to each other by a common face , a solid bounded by six ...
Page 262
... tang CA tang CD :: tang CE : tang in other words , if the tangents of the half - sides containing the equal angles are reciprocally pro- portional . Second . On the given side CD , and with the same angle C , to make a triangle CDE ...
... tang CA tang CD :: tang CE : tang in other words , if the tangents of the half - sides containing the equal angles are reciprocally pro- portional . Second . On the given side CD , and with the same angle C , to make a triangle CDE ...
Page 264
... tang S = 1 cos 2 a— cos 2 a + b + c N sin 2 b - sin sin 2 · cos 2 1⁄2 c + 2 cos acos bcosc a + b - c a + c - b 2 b + c - a sin 2 But the numerator of this expression may be put under the form ... tang Stang tang- tang a + b + c a 264 NOTE X.
... tang S = 1 cos 2 a— cos 2 a + b + c N sin 2 b - sin sin 2 · cos 2 1⁄2 c + 2 cos acos bcosc a + b - c a + c - b 2 b + c - a sin 2 But the numerator of this expression may be put under the form ... tang Stang tang- tang a + b + c a 264 NOTE X.
Page 265
With Notes Adrien Marie Legendre. tang Stang tang- tang a + b + c a + b - c a + c - b b + a - c tang 4 4 4 4 For this very elegant formula , we are indebted to Simon Lhuillier . PROBLEM II . Given the three sides BC = a , AC = b , AB = c ...
With Notes Adrien Marie Legendre. tang Stang tang- tang a + b + c a + b - c a + c - b b + a - c tang 4 4 4 4 For this very elegant formula , we are indebted to Simon Lhuillier . PROBLEM II . Given the three sides BC = a , AC = b , AB = c ...
Page 266
... tang b cote , we get tang ? = ; COS X hence tang = M 4 sina sin b sin c 2 sina sin b sin c ( sin sin a + b + c a + b C a + c - b b + c - a sin sin 2 2 2 2 -a ) PROBLEM III . On the surface of the sphere , to determine the line , in ...
... tang b cote , we get tang ? = ; COS X hence tang = M 4 sina sin b sin c 2 sina sin b sin c ( sin sin a + b + c a + b C a + c - b b + c - a sin sin 2 2 2 2 -a ) PROBLEM III . On the surface of the sphere , to determine the line , in ...
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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.