Plane Trigonometry ...1860 |
From inside the book
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Page 7
... length of the arc of the circle inter- cepted between the lines to the length of the radius . We shall re- quire some preliminary propositions ; the proposition in Art . 14 is sometimes assumed , and the beginner may adopt this course ...
... length of the arc of the circle inter- cepted between the lines to the length of the radius . We shall re- quire some preliminary propositions ; the proposition in Art . 14 is sometimes assumed , and the beginner may adopt this course ...
Page 8
... = = 3.14159 .... 16. The angle subtended at the centre of a circle by an arc which is equal in length to the radius is an invariable angle . A With centre O and any radius OA describe a circle တ CIRCULAR MEASURE OF AN ANGLE .
... = = 3.14159 .... 16. The angle subtended at the centre of a circle by an arc which is equal in length to the radius is an invariable angle . A With centre O and any radius OA describe a circle တ CIRCULAR MEASURE OF AN ANGLE .
Page 9
... length to the radius ; let r denote the radius , and 7 the length of the arc AC . Then , since angles at the centre of a circle are proportional to the arcs on which they stand , therefore angle AOC AC = angle AOB AB γ Z angle 40C = x ...
... length to the radius ; let r denote the radius , and 7 the length of the arc AC . Then , since angles at the centre of a circle are proportional to the arcs on which they stand , therefore angle AOC AC = angle AOB AB γ Z angle 40C = x ...
Page 13
... length is 9 inches . 3. Find the circular measure of 18. 1 ' . 4. There are three angles ; the circular measure of the first π exceeds that of the second by the sum of the second and third 10 is 30 grades , and the sum of the first and ...
... length is 9 inches . 3. Find the circular measure of 18. 1 ' . 4. There are three angles ; the circular measure of the first π exceeds that of the second by the sum of the second and third 10 is 30 grades , and the sum of the first and ...
Page 16
... lengths , but ratios of one length to another ; that is , they are arithmetical whole numbers or fractions . 29. The defect of any angle from a right angle is called the complement of that angle ; thus if A denote the number of degrees ...
... lengths , but ratios of one length to another ; that is , they are arithmetical whole numbers or fractions . 29. The defect of any angle from a right angle is called the complement of that angle ; thus if A denote the number of degrees ...
Common terms and phrases
A+B+C Algebra angle increases angular AP coincides approximately arithmetical arithmetical progression calculated centre circular measure circumscribed circle cloth cos² cos³ cosec cosine cotangent Crown 8vo deduce denote distance Edition equal equation error example expression factors formula four right angles given angle given log greater height Hence inscribed circle integer less loga logarithmic sine number of degrees obtain ph cot places of decimals plane positive angle positive integer preceding article prove quadrant quantity radius regular polygon right angle right-angled triangle sec² secant shew shewn sides Similarly sin A sin sin² sin³ sine sine and cosine student subtend suppose Table tabular logarithmic tan-¹ tan¯¹ tan² tan³ tangent theorem tower Treatise triangle ABC Trigonometrical Functions Trigonometrical Ratios unity zero
Popular passages
Page 9 - Radian is the angle subtended, at the centre of a circle, by an arc equal in length to the radius...
Page 18 - The square described on the hypothenuse of a rightangled triangle is equal to the sum of the squares described on the other two sides.
Page 1 - Mr Smith's Work is a most useful publication. The Rules are stated with great clearness. The Examples are well selected and worked cut with just sufficient detail without being encumbered by too minute explanations; and there prevails throughout it that just proportion of theory and practice, which is the crowning excellence of an elementary work.
Page 22 - The author has endeavoured to connect the history of the New Testament Canon with the growth and consolidation of the Church, and to point out the relation existing between the amount of evidence for the authenticity of its component parts, and the whole mass of Christian literature.
Page 4 - Mathematics. Each chapter is followed by a set of Examples: those which are entitled Miscellaneous Examples, together with a few in some of the other sets, may be advantageously...
Page 221 - From eight times the chord of half the arc, subtract the chord of the whole arc, and divide the remainder by 3, and the quotient will be the length of the arc, nearly.
Page 93 - The logarithm of any power, integral or fractional, of a number is equal to the product of the logarithm of the number by the index of the power. For let m = a"; therefore m' = (a")
Page 94 - ... is some number between — 2 and — 3 ; that is, — 3 plus a fraction ; and so on. 5. In the common system, as the logarithms of all numbers which are not ^exact powers of 10 are incommensurable with those numbers, their values can only be obtained approximately, and are expressed by decimals. 6. The integral part of any logarithm is called the CHARACTERISTIC, and the decimal part is sometimes called the MANTISSA.
Page 51 - To express the cosine of the sum of two angles in terms of the sines and cosines of the angles themselves.