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angular appears Area base becomes calculated called CHAPTER circle circular measure computed contained corresponding cosec described determined difference digits direction distance draw equal equation error EXAMPLES expression faces factors figure formulæ give given Goniometrical Ratios greater Hence horizontal inclination increases increment integer intersect Join known L sin last Article length less logarithms magnitude manner mantissa means meet method nearly negative object observed obtained opposite perpendicular places plane pole polygon positive produced projection proved quantity radius regular represented respectively result right angles shew shewn sides Similarly sin A sin Sines Sines and Cosines sinº solid sphere Spherical Excess spherical triangle straight line subtended supposed surface tables taken tangents unit Whence Wherefore
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 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.