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 14
... angles which they form are called adjacent angles . Thus , the A angles ABD and DBC are adjacent . 12. A RIGHT ANGLE is formed by one straight line meeting another so ... angle 15. An OBTUSE ANGLE is greater than a right angle 14 GEOMETRY .
... angles which they form are called adjacent angles . Thus , the A angles ABD and DBC are adjacent . 12. A RIGHT ANGLE is formed by one straight line meeting another so ... angle 15. An OBTUSE ANGLE is greater than a right angle 14 GEOMETRY .
Page 15
... right angle . 16. Two straight lines are parallel , when they lie in the same plane and can- not meet , how far ... angles formed by the sides , are called angles of the polygon . 19. Polygons are classified according to the number of ...
... right angle . 16. Two straight lines are parallel , when they lie in the same plane and can- not meet , how far ... angles formed by the sides , are called angles of the polygon . 19. Polygons are classified according to the number of ...
Page 16
... angles , taken in the same order , are equal , each to each . 23. A DIAGONAL ... right - angled and oblique - angled . 1st . A RIGHT - ANGLED TRIANGLE is one ... angle of an oblique - angled triangle is 16 GEOMETRY .
... angles , taken in the same order , are equal , each to each . 23. A DIAGONAL ... right - angled and oblique - angled . 1st . A RIGHT - ANGLED TRIANGLE is one ... angle of an oblique - angled triangle is 16 GEOMETRY .
Page 17
... angles are acute , the triangle is said to be ACUTE - ANGLED . 26. Quadrilaterals are classified with reference to ... right angles . ( A SQUARE is an equilateral rectangle . 21. A RHOMBOID is a parallelogram whose angles are all oblique ...
... angles are acute , the triangle is said to be ACUTE - ANGLED . 26. Quadrilaterals are classified with reference to ... right angles . ( A SQUARE is an equilateral rectangle . 21. A RHOMBOID is a parallelogram whose angles are all oblique ...
Page 18
... right angles are equal . 11. Only one straight line can be drawn joining two given points . 12. The shortest distance from one point to another is measured on the straight line which joins them . 13. Through the same point , only one ...
... right angles are equal . 11. Only one straight line can be drawn joining two given points . 12. The shortest distance from one point to another is measured on the straight line which joins them . 13. Through the same point , only one ...
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Common terms and phrases
AB² AC² adjacent angles altitude angle ACB 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 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 mean proportional 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 six right slant height sphere spherical polygon spherical triangle square Tang tangent THEOREM triangle ABC triangular prisms triedral angle upper base vertex vertices whence