Elements of Geometry and Trigonometry: From the Works of A.M. Legendre |
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Page 25
... BC will coincide with the side EF ( A. 11 ) . The two triangles , therefore , coincide throughout , and are consequently equal in all their parts ( I. , D. 14 ) ; which was to ... side BU taking the direction EF , and the side BA BOOK I. 25.
... BC will coincide with the side EF ( A. 11 ) . The two triangles , therefore , coincide throughout , and are consequently equal in all their parts ( I. , D. 14 ) ; which was to ... side BU taking the direction EF , and the side BA BOOK I. 25.
Page 26
... BC is equal to EF , the vertex C will coincide with the vertex F ; and because the angle C is equal to the angle F , the side ... side . Let ABC be a triangle : then will the sum of any two sides , as AB , BC , be greater than the third side ...
... BC is equal to EF , the vertex C will coincide with the vertex F ; and because the angle C is equal to the angle F , the side ... side . Let ABC be a triangle : then will the sum of any two sides , as AB , BC , be greater than the third side ...
Page 27
... side , their sum will be less than that of the two remaining sides of the triangle . Let be any point within the triangle BAC , and let the lines OB , OC , be drawn to the extremities of any side , as BC : then will the sum of BO and Ос ...
... side , their sum will be less than that of the two remaining sides of the triangle . Let be any point within the triangle BAC , and let the lines OB , OC , be drawn to the extremities of any side , as BC : then will the sum of BO and Ос ...
Page 28
... sides and the included angle of the one equal to two sides and the included angle of the other , each to each ; consequently , GC is equal to EF ( P. V. ) . Now , the point G may be without the triangle ABC , it may be on the side BC ...
... sides and the included angle of the one equal to two sides and the included angle of the other , each to each ; consequently , GC is equal to EF ( P. V. ) . Now , the point G may be without the triangle ABC , it may be on the side BC ...
Page 29
... BC > AB + EF . Taking away the common part AB , there remains ( A. 5 ) , BC > EF . 2o . When G is on BC . In this ... side AB is equal to the side DE , the side AC to DF , and BU greater than EF , then will the angle BAC be greater than ...
... BC > AB + EF . Taking away the common part AB , there remains ( A. 5 ) , BC > EF . 2o . When G is on BC . In this ... side AB is equal to the side DE , the side AC to DF , and BU greater than EF , then will the angle BAC be greater than ...
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Common terms and phrases
AB² ABCD AC² adjacent angles altitude apothem Applying logarithms base and altitude bisect centre chord circle circumference circumscribed coincide cone consequently convex surface corresponding cosec cosine Cotang cylinder denote diagonals diameter difference distance divided draw drawn edges equally distant feet find the area Formula frustum given angle given straight line greater hence homologous hypothenuse included angle interior angles intersection less Let ABC log sin lower base mantissa measured by half number of sides opposite parallel parallelogram parallelopipedon perimeter perpendicular plane MN polyedral angle polyedron prism PROPOSITION proved pyramid quadrant radii radius rectangle regular polygons right angles right-angled triangle Scholium secant segment semi-circumference side BC similar sine slant height sphere spherical polygon spherical triangle square subtracted Tang tangent THEOREM triangle ABC triangular prisms triedral angle upper base vertex vertices whence
Popular passages
Page 126 - The square of the hypothenuse is equal to the sum of the squares of the other two sides ; as, 5033 402+302.
Page 59 - A'B'C', and applying the law of cosines, we have cos a' = cos b' cos c' + sin b' sin c' cos A'. Remembering the relations a' = 180° -A, b' = 180° - B, etc. (this expression becomes cos A = — cos B cos C + sin B sin C cos a.
Page 18 - The circumference of every circle is supposed to be divided into 360 equal parts called degrees, and each degree into 60 equal parts called minutes, and each minute into 60 equal parts called seconds, and these into thirds, fourths, &c.
Page 104 - The square described on the hypothenuse of a rightangled triangle is equal to the sum of the squares described on the other two sides.
Page 6 - The logarithm of any power of a number is equal to the logarithm of the number multiplied by the exponent of the power.
Page 28 - If two triangles have two sides of the one equal to two sides of the...
Page 46 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Page 99 - The area of a parallelogram is equal to the product of its base and altitude.
Page 172 - If two planes are perpendicular to 'each other, a straight line drawn in one of them, perpendicular to their intersection, will be perpendicular to the other.
Page 214 - A sphere is a solid bounded by a curved surface, every point of which is equally distant from a point within called the center.