Elementary Trigonometry: With a Collection of ExamplesDeighton, Bell, and Company, 1862 - 184 páginas |
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Página 1
... less than two right angles . In Trigonometry , however , we regard an angle as capa- ble of being of any magnitude whatever , and consequently Tρlywvov , a triangle , and perpéw , I measure . H. T. * B must have proper regard to the ...
... less than two right angles . In Trigonometry , however , we regard an angle as capa- ble of being of any magnitude whatever , and consequently Tρlywvov , a triangle , and perpéw , I measure . H. T. * B must have proper regard to the ...
Página 8
... less than OA . Then OB will contain a - b units of length . If we suppose any assigned point A to be reached by a point starting from O and tra- velling along the line OX , B will be determined by the point travelling back from A over b ...
... less than OA . Then OB will contain a - b units of length . If we suppose any assigned point A to be reached by a point starting from O and tra- velling along the line OX , B will be determined by the point travelling back from A over b ...
Página 12
... less than unity . The defect of the cosine from unity is called the versed sine . The versed sine of A is generally written versin A. Twice the sine of the half of A is called the chord of A , for a reason which will be hereafter ...
... less than unity . The defect of the cosine from unity is called the versed sine . The versed sine of A is generally written versin A. Twice the sine of the half of A is called the chord of A , for a reason which will be hereafter ...
Página 16
... less than a right angle . It will be a useful exercise for the student to establish their truth for any other position of OP . 8. The following simple formulæ are of constant oc- currence : PN PN OP sin A tan A = = = ON ON cos A 1 OP I ...
... less than a right angle . It will be a useful exercise for the student to establish their truth for any other position of OP . 8. The following simple formulæ are of constant oc- currence : PN PN OP sin A tan A = = = ON ON cos A 1 OP I ...
Página 21
... the values of the other trigonometrical ratios of 18 ° . 13. The circular measure of an angle is greater than the sine and less than the tangent of the angle . T Р N A Τ Let PAP ' be an arc of a circle the Functions of 18 ° . 21.
... the values of the other trigonometrical ratios of 18 ° . 13. The circular measure of an angle is greater than the sine and less than the tangent of the angle . T Р N A Τ Let PAP ' be an arc of a circle the Functions of 18 ° . 21.
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Términos y frases comunes
a+b+c a²+b² angle AOP angle of elevation angular arithmetical progression B-sin bisecting centre circular measure circumference circumscribing circle cos² cos³ cosec cosine decimal decreases in magnitude determined distance equal escribed circles EXAMPLES ILLUSTRATING CHAPTER feet Find the number find the value formula Given log given value Hence horizontal plane increases inscribed integer logarithm mount Ebal number of degrees number of grades Observe the angles perpendicular polygon Prove Quadrant quadrilateral radii radius regular polygon respectively revolving line right angle sec² secant secondary angle shew sides sign and magnitude similar triangles Similarly sin A sin sin A+B sin² sin³ sine sines and cosines Solve the equation solve the triangle straight line subtend tan² tangent tower triangle ABC trigono trigonometrical functions versin π π пп
Pasajes populares
Página 64 - The logarithm of the product of two numbers is equal to the sum of the logarithms of the numbers.
Página 1 - A plane rectilineal angle is the inclination of two straight lines to one another, which meet together, but are not in the same straight line.
Página 175 - ... 66. Construct an equilateral triangle, having given the length of the perpendicular drawn from one of the angles on the opposite side. 67. Having given the straight lines which bisect the angles at the base of an equilateral triangle, determine a side of the triangle. 68. Having given two sides and an angle of a triangle, construct the triangle, distinguishing the different cases. 69. Having given the base of a triangle, the difference...
Página 37 - B + cos A . sin B tan(A + B)= ) , (- = — . --. v cos (A + B) cos A . cos B — sin A . sin B and dividing numerator and denominator by cos A . cos B, sin A sin B cos A "'"cos B tan A + tan B 1 tan A.
Página 175 - Three circles are described, each of which touches one side of a triangle ABC, and the other two sides produced. If D be the point of contact of the side BC, E that of AC, and F that of AB, shew that AE is equal to BD, BF to CE, and CD to AF.
Página 5 - Now the angle at the centre of a circle which is subtended by an arc equal to the radius equals — = 57°. 29578, it so that the true length of a curve is given by the equation t IR L — ~ — — 57.2958 — 57.2958...
Página 113 - ... would be subtended at the centre of the first by an arc equal to the radius of the second. 9. If a be the arc which measures the complement of an angle to radius r, find the arc which measures the supplement of the same angle to radius r'.
Página 159 - It is required to bisect any triangle (1) bya line drawn parallel, (2) by a line drawn perpendicular, to the base. 43. To divide a given triangle into two parts, having a given ratio to one another, by a straight line drawn parallel to one of its...