The Elements of Plane and Spherical Trigonometry: With the Construction and Use of Tables of Logarithms

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Macmillan and Company, 1880 - 240 páginas
 

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Página 87 - Logarithm of a number to a given base is the index of the power to which the base must be raised to give the number.
Página 166 - Any two sides of a spherical triangle are together greater than the third, and the sum of the three sides is less than the circumference of a great circle.
Página 34 - Mathematics which treats of the solution of plane triangles. In every plane triangle there are six parts : three sides and three angles. When three of these parts are given, one being a side, the remaining parts may be found by computation. The operation of finding the unknown parts is called the solution of the triangle.
Página 143 - A person observes the elevation of a tower to be 60", and on receding from it 100 yards further he finds the elevation to be 30"; required the height of the tower.
Página 144 - The angular elevation of a tower at a place A due south of it is 30° ; and at a place B due west of A, and at a distance a from it, the elevation is 18°...
Página 35 - ... the three interior angles of' a triangle are together equal to two right angles.
Página 168 - The sum of the angles of a spherical triangle is greater than two and less than six right angles ; that is, greater than 180° and less than 540°. (gr). If A'B'C' is the polar triangle of ABC...
Página 161 - BC, or side a, is used, the angle subtended at the center of the sphere by the arc BC which is opposite to the spherical angle A, is invariably meant.
Página 180 - ... and the complements of the other angles are called the circular parts of the triangle. Thus there are five circular parts...

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