Elements of Plane and Spherical Trigonometry: With Numerous Examples |
Other editions - View all
Common terms and phrases
1st quadrant 2d quadrant acute angle adjacent side algebraically ambiguity angle AOP angle in degrees angle of elevation angle or arc arc AP called centesimal centre circle circular measure colog complement cos x cos cos² cos²x cosec cotangent coty coversed sine denoted equal equation EXAMPLES express feet find the height Find the number formulæ Hence hypotenuse Let ABC Let the angle log cot miles Napier's Rules negative perpendicular plane polar triangle positive Prove the following radian radius ratio reflex angle respectively revolving line right angles right triangle secant Sexagesimal sin b sin sin x cos sin² sin²x sine and cosine sinx siny spherical triangle subtends tan-¹ tan² tan²x tangent tany three angles tions trigonometric functions versed sine x cos y yards ОР
Popular passages
Page 73 - In any triangle the square of any side is equal to the sum of the squares of the other two sides minus twice the product of these two sides and the cosine of their included angle.
Page 72 - Law of Sines - In any triangle, the sides are proportional to the sines of the opposite angles. That is, sin A = sin B...
Page 123 - 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 6 - Radian is the angle subtended, at the centre of a circle, by an arc equal in length to the radius...
Page 74 - In every plane triangle, the sum of two sides is to their difference as the tangent of half the sum of the angles opposite those sides is to the tangent of half their difference.
Page 121 - The law of sines states that in any spherical triangle the sines of the sides are proportional to the sines of their opposite angles: sin a _ sin b __ sin c _ sin A sin B sin C...
Page 117 - Rules are : (1) The sine of the middle part equals the product of the tangents of the adjacent parts. (2) The sine of the middle part equals the product of the cosines of the opposite parts.
Page 123 - ... cos a = cos b cos с + sin b sin с cos A ; (2) cos b = cos a cos с + sin a sin с cos в ; ^ A. (3) cos с = cos a cos b + sin a sin b cos C.
Page 111 - On the bank of a river there is a column 200 feet high, supporting a statue 30 feet high ; the statue to an observer on the opposite bank subtends the same angle as a man 6 feet high standing at the base of the column : find the breadth of the river.
Page 3 - O in the direction contrary to that of the hands of a watch.