## An Elementary Trigonometry |

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### Common terms and phrases

00 incr acute angle adjacent sides angle of depression angle of elevation arc or angle arithm become by means centre characteristic column marked comp complement corresponding to Log cosec Cosine Sine decimal Divide Eaton's Elementary Algebra feet find the area find the degrees Find the Log find the Logarithm Find the Natural find the sine fraction Geom Given a 195 given angle given side Given the Log half the sum half their difference height horizontal plane hypothenuse included angle Logarithmic Sine M.
M. Sine measured minus Multiply Natural Number corresponding Number to Log parallax parallelogram perpendicular plane triangle prefix quadr quotient radius is unity right-angled triangle Scholium side opposite sine and cosine sine obtained Sines and Tangents subtract Tang tangent of half three sides tower trapezoid TRIGONOMETRIC FUNCTIONS Trigonometry Versed Sine ВАС ВС

### Popular passages

Page 23 - A = sin. A : a which is the same as the first proportion in Theorem I. THEOREM III. 48. In any plane triangle, the sum of any two sides is to their difference, as the tangent of half the sum of the opposite angles is to the tangent of half their difference. Let ABC be a plane triangle;

Page 63 - I. Multiply half the sum of the parallel sides by the perpendicular distance between them. 144. If the angles are known, we can use RULE II. Divide the trapezoid by a diagonal, and find the area of each triangle

Page 24 - 2 As the product of the sum and difference of two quantities is equal to the difference of their squares, we have (AD

Page 50 - 1.979924 109. If В С, the side opposite the given angle, is less than the other given side AB, and the given angle is acute, there are two triangles which satisfy the conditions, viz. ABC and ABD, in which the angles

Page 62 - As the product of the sum and difference of two quantities is equal to the difference of their squares, we have 4

Page 47 - is to their difference, as the tangent of half the sum of the opposite angles is to the tangent of