Elements of Geometry and Trigonometry: With Notes |
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Page 1
... line are called points : a point , there- fore , occupies no space . III . A straight line is the shortest distance from one point to another . IV . Every line , which is not straight , or composed of straight lines , is a curve line ...
... line are called points : a point , there- fore , occupies no space . III . A straight line is the shortest distance from one point to another . IV . Every line , which is not straight , or composed of straight lines , is a curve line ...
Page 2
... straight line AB meets ano- ther straight line CD , so as to make the adja- cent angles BAC , BAD equal to each other , each of those angles is called a right angle ; and the line AB is said to be perpendicular to CD . XI . Every angle ...
... straight line AB meets ano- ther straight line CD , so as to make the adja- cent angles BAC , BAD equal to each other , each of those angles is called a right angle ; and the line AB is said to be perpendicular to CD . XI . Every angle ...
Page 5
... straight line can be drawn . 5. Two magnitudes , lines , surfaces , or solids , are equal , if , when applied to each other , they coincide throughout their whole extent . PROPOSITION I. THEOREM . All right angles are equal to each ...
... straight line can be drawn . 5. Two magnitudes , lines , surfaces , or solids , are equal , if , when applied to each other , they coincide throughout their whole extent . PROPOSITION I. THEOREM . All right angles are equal to each ...
Page 6
... line GH cannot fall on a line CK different from CD ; there- fore it falls on CD , and the angle EGH on ACD ; therefore all right angles are equal to each other . PROPOSITION II . THEOREM . Every straight line CD , which meets another AB ...
... line GH cannot fall on a line CK different from CD ; there- fore it falls on CD , and the angle EGH on ACD ; therefore all right angles are equal to each other . PROPOSITION II . THEOREM . Every straight line CD , which meets another AB ...
Page 7
... line CF , mak- ing with CA the right angle ACF . Now since ACD is a straight line , the angle FCD will be right ( Prop . 2. cor . 1. ) ; and since ACE is a straight line , the angle FCE will likewise be right . But the part FCE cannot ...
... line CF , mak- ing with CA the right angle ACF . Now since ACD is a straight line , the angle FCD will be right ( Prop . 2. cor . 1. ) ; and since ACE is a straight line , the angle FCE will likewise be right . But the part FCE cannot ...
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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
ACē adjacent adjacent angles altitude angle ACB angle BAC centre chord circ circle circular sector circumference circumscribed common cone consequently construction continued fraction convex surface cosē 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 sinē 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.