Elements of Geometry and Trigonometry: With Notes |
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Page 29
... radii CA , CD . In the right - angled triangles CAF , D DCG , the hypotenuses CA , CD are equal ; and the side AF , the half of AB , is equal to the side DG , the half of DE : hence the triangles are equal ( 18. I. ) , and CF is equal ...
... radii CA , CD . In the right - angled triangles CAF , D DCG , the hypotenuses CA , CD are equal ; and the side AF , the half of AB , is equal to the side DG , the half of DE : hence the triangles are equal ( 18. I. ) , and CF is equal ...
Page 32
... radii , the greater radius being at the same time less than the sum of the smaller and the distance between the centres , the two circles will cut each other . For to make an intersection possible , the triangle CAD ( see the preceding ...
... radii , the greater radius being at the same time less than the sum of the smaller and the distance between the centres , the two circles will cut each other . For to make an intersection possible , the triangle CAD ( see the preceding ...
Page 34
... radii . Let the less angle be placed on the greater . If the pro- position is not true , the angle ACB will be to the angle ACD as the arc AB is to an arc greater or less than AD . Suppose this arc to be great- C DIO er , and let it be ...
... radii . Let the less angle be placed on the greater . If the pro- position is not true , the angle ACB will be to the angle ACD as the arc AB is to an arc greater or less than AD . Suppose this arc to be great- C DIO er , and let it be ...
Page 35
... radii , as all the foregoing propositions imply . Scholium 1. It appears most natural to measure a quantity by a quantity of the same species ; and upon this principle it would be convenient to refer all angles to the right angle ...
... radii , as all the foregoing propositions imply . Scholium 1. It appears most natural to measure a quantity by a quantity of the same species ; and upon this principle it would be convenient to refer all angles to the right angle ...
Page 36
... radii CB , CD . E The angle BCE , being exterior to the triangle ABC , is equal to the sum of the two interior angles CAB , ABC ( 23.1 ) : but the triangle BAC being isosceles , the angle CAB is equal to ABC ; hence the angle BCE is ...
... radii CB , CD . E The angle BCE , being exterior to the triangle ABC , is equal to the sum of the two interior angles CAB , ABC ( 23.1 ) : but the triangle BAC being isosceles , the angle CAB is equal to ABC ; hence the angle BCE is ...
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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.