Elements of Geometry and Trigonometry: From the Works of A.M. Legendre |
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Page 35
... given point to a given straight line , only two equal straight lines can be drawn ; for , if there could be more , there would be at least two equal oblique lines on the same side of the perpendicular ; which is impossible . PROPOSITION ...
... given point to a given straight line , only two equal straight lines can be drawn ; for , if there could be more , there would be at least two equal oblique lines on the same side of the perpendicular ; which is impossible . PROPOSITION ...
Page 44
... given , the third will be found by subtracting their sum from two right angles . Cor . 2. If two angles of one triangle are respectively equal to two angles of another , the two triangles are mutually equiangular . Cor . 3. In any ...
... given , the third will be found by subtracting their sum from two right angles . Cor . 2. If two angles of one triangle are respectively equal to two angles of another , the two triangles are mutually equiangular . Cor . 3. In any ...
Page 49
... given straight line , and on the same side of it , the straight line joining them will be parallel to the given line . PROPOSITION XXXI . THEOREM . The diagonals of a parallelogram divide each other into equal parts , or mutually bisect ...
... given straight line , and on the same side of it , the straight line joining them will be parallel to the given line . PROPOSITION XXXI . THEOREM . The diagonals of a parallelogram divide each other into equal parts , or mutually bisect ...
Page 58
... given pro- portions : hence , If four quantities are proportional , their squares will be proportional . Cor . 2. If the principle of the proposition be extended to three or more proportions , and the corresponding terms of each be ...
... given pro- portions : hence , If four quantities are proportional , their squares will be proportional . Cor . 2. If the principle of the proposition be extended to three or more proportions , and the corresponding terms of each be ...
Page 82
... given straight line . Let AB be a given straight line . From A and B , as centres , with a radius greater than one half of AB , describe arcs intersecting at E and F : join E and F , by the straight line EF . Then will EF bisect the ...
... given straight line . Let AB be a given straight line . From A and B , as centres , with a radius greater than one half of AB , describe arcs intersecting at E and F : join E and F , by the straight line EF . Then will EF bisect the ...
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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.