Elements of Geometry and Trigonometry from the Works of A.M. Legendre: Adapted to the Course of Mathematical Instruction in the United States |
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Page 61
... centre . The bounding line is called the cir- cumference . 2. A RADIUS is a straight line drawn from the centre . to any point of the circumference . 3. A DIAMETER is a straight line drawn through the centre and terminating in the ...
... centre . The bounding line is called the cir- cumference . 2. A RADIUS is a straight line drawn from the centre . to any point of the circumference . 3. A DIAMETER is a straight line drawn through the centre and terminating in the ...
Page 62
... circumference touches each of the sides of the polygon . о © о POSTULATE . A circumference can be described from any point as a centre , and with any radius . 63 PROPOSITION I. THEOREM . Any diameter divides the circle 62.
... circumference touches each of the sides of the polygon . о © о POSTULATE . A circumference can be described from any point as a centre , and with any radius . 63 PROPOSITION I. THEOREM . Any diameter divides the circle 62.
Page 63
... centre ; which is impossible ( D. 1 ) : hence , AB divides the circle , and also its circum- ference , into two equal parts ; which was to be proved . PROPOSITION II . THEOREM . A diameter is greater than any other chord . Let AD be a ...
... centre ; which is impossible ( D. 1 ) : hence , AB divides the circle , and also its circum- ference , into two equal parts ; which was to be proved . PROPOSITION II . THEOREM . A diameter is greater than any other chord . Let AD be a ...
Page 65
... centre O shall fall upon the centre C , and the point E then , because the arc . EGP is greater than AMD , the point P will fall at some point H , beyond D , and the chord EP upon A ; will take the position AH . Now , the sides equal to ...
... centre O shall fall upon the centre C , and the point E then , because the arc . EGP is greater than AMD , the point P will fall at some point H , beyond D , and the chord EP upon A ; will take the position AH . Now , the sides equal to ...
Page 67
... centre of the circle . But Scholium . The centre C , the middle point D of the chord AB , and the middle point G of the subtended arc , are points of the radius perpendicular to the chord . two points determine the position of a ( A. 11 ) ...
... centre of the circle . But Scholium . The centre C , the middle point D of the chord AB , and the middle point G of the subtended arc , are points of the radius perpendicular to the chord . two points determine the position of a ( A. 11 ) ...
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Common terms and phrases
ABCD AC² adjacent angles altitude apothem Applying logarithms bisects centre chord circle circumference circumscribed cone consequently convex surface cosec cosine Cotang cylinder denote diagonals diameter difference distance divided draw drawn edges equilateral feet find the area formula frustum given angle given line given point greater hence homologous hypothenuse included angle inscribed intersection isosceles less Let ABC log sin lower base lune mantissa number of sides parallel parallelogram parallelopipedon perimeter perpendicular plane angles plane MN polyedral angle polyedron principle demonstrated prism PROBLEM.-In PROPOSITION proved pyramid quadrant radii radius rectangle regular polygon right angles right-angled triangle Scholium secant segment semi-circumference similar sine slant height solution sphere spherical angle spherical polygon spherical triangle square straight line subtracting supplement Tang tangent THEOREM THEOREM.-Show tri-rectangular triangle ABC triangular prism triedral angle upper base vertex vertices volume whence
Popular passages
Page 28 - If two triangles have two sides of the one equal to two sides of the...
Page 90 - A cos 6 = cos a cos c + sin a sin c cos B cos c = cos a cos 6 + sin a sin 6 cos C Law of Cosines for Angles cos A = — cos B...
Page 18 - Things which are equal to the same thing, are equal to each other. 2. If equals are added to equals, the sums are equal. 3. If equals are subtracted from equals, the remainders are equal. 4. If equals are added to unequals, the sums are unequal.
Page 4 - The logarithm of any power of a number is equal to the logarithm of the number multiplied by the exponent of the power.
Page 253 - For, the point A being the pole of the arc EF, the distance AE is a 'quadrant ; the point C being the pole of the arc DE, the distance CE is likewise a quadrant : hence the point E is...
Page 61 - A Circle is a plane figure bounded by a curved line every point of which is equally distant from a point within called the center.
Page 94 - 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 126 - If two polygons are composed of the same number of triangles, similar each to each and similarly placed, the polygons are similar.
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 125 - THEOREM. Similar triangles are to each other as the squares of their homologous sides.