Elements of Geometry and Trigonometry |
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Page 14
... 88 to make the adjacent angles unequal . D C B Oblique angles are subdivided into two classes , acute angles , and obtuse angles . 14. An ACUTE ANGLE is less than a right angle . 15. An OBTUSE ANGLE is greater than a right angle 14 GEOMETRY ...
... 88 to make the adjacent angles unequal . D C B Oblique angles are subdivided into two classes , acute angles , and obtuse angles . 14. An ACUTE ANGLE is less than a right angle . 15. An OBTUSE ANGLE is greater than a right angle 14 GEOMETRY ...
Page 15
Adrien Marie Legendre. 15. An OBTUSE ANGLE is greater than a right angle . 16. Two straight lines are parallel , when they lie in the same plane and can- not meet , how far soever , either way , both may be produced . They then have the ...
Adrien Marie Legendre. 15. An OBTUSE ANGLE is greater than a right angle . 16. Two straight lines are parallel , when they lie in the same plane and can- not meet , how far soever , either way , both may be produced . They then have the ...
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
Adrien Marie Legendre. If one angle of an oblique - angled triangle is obtuse , the triangle is said to be OBTUSE - Angled . If all of the angles ... right angles . A SQUARE is an equilateral rectangle . 2d . A RHOMBOID is a parallelogram ...
Adrien Marie Legendre. If one angle of an oblique - angled triangle is obtuse , the triangle is said to be OBTUSE - Angled . If all of the angles ... right angles . A SQUARE is an equilateral rectangle . 2d . A RHOMBOID is a parallelogram ...
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
ABCD ACē 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 line given point greater hence homologous hypothenuse included angle interior angles intersection less Let ABC log sin logarithm lower base mantissa mean proportional measured by half middle point number of sides opposite parallel parallelogram parallelopipedon perimeter perpendicular plane MN polyedral angle polyedron prism PROBLEM PROPOSITION proved pyramid quadrant radii radius rectangle regular polygons right angles right-angled triangle Scholium secant segment side BC similar sine slant height sphere spherical polygon spherical triangle square Tang tangent THEOREM triangle ABC triangular prisms triedral angle upper base vertex vertices whence