A Treatise on Plane and Spherical Trigonometry: Including the Construction of the Auxiliary Tables; a Concise Tract on the Conic Sections, and the Principles of Spherical ProjectionH. Orr, 1844 - 228 sider |
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Side 32
... semicircle , is called its supple- ment . Thus BHD is the supplement of AB . 10. The circumference of every circle is supposed to be divided into 360 equal parts , called degrees ; each degree into 60 equal parts , called minutes ; each ...
... semicircle , is called its supple- ment . Thus BHD is the supplement of AB . 10. The circumference of every circle is supposed to be divided into 360 equal parts , called degrees ; each degree into 60 equal parts , called minutes ; each ...
Side 34
... semicircle , as AL , the sine LM is still positive , but the cosine CM is negative , being measured from C in a direction opposite to CF. The tangent AP and secant CP are also negative ; the former being drawn in a direction opposite to ...
... semicircle , as AL , the sine LM is still positive , but the cosine CM is negative , being measured from C in a direction opposite to CF. The tangent AP and secant CP are also negative ; the former being drawn in a direction opposite to ...
Side 35
... semicircle , but less than three quadrants , as AHDN ; the sine MN be- comes negative , the cosine CM also negative , the tangent AG positive ; but the secant CG , not being produced through N , but in the opposite direction , is ...
... semicircle , but less than three quadrants , as AHDN ; the sine MN be- comes negative , the cosine CM also negative , the tangent AG positive ; but the secant CG , not being produced through N , but in the opposite direction , is ...
Side 40
... semicircle being a right one ( 31.3 ) , ECG is also a right angle . Now , because BC is parallel to EG ; DB : BE :: DC : CG ( 2.6 ) . But CD is the tangent of CED , and CG the tangent of CEG , suited to the radius EC ; and these ...
... semicircle being a right one ( 31.3 ) , ECG is also a right angle . Now , because BC is parallel to EG ; DB : BE :: DC : CG ( 2.6 ) . But CD is the tangent of CED , and CG the tangent of CEG , suited to the radius EC ; and these ...
Side 54
... semicircle ; ADC its diameter ; D the centre ; AB the chord of an arc ; AE , BG , lines touching the cir- cle in A and B , and meeting in G. Join DG , DB , CB ; and produce DB , CB , to meet AE in E and F. = Now , the angle ABC in a ...
... semicircle ; ADC its diameter ; D the centre ; AB the chord of an arc ; AE , BG , lines touching the cir- cle in A and B , and meeting in G. Join DG , DB , CB ; and produce DB , CB , to meet AE in E and F. = Now , the angle ABC in a ...
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A Treatise on Plane and Spherical Trigonometry: Including the Construction ... Enoch Lewis Uten tilgangsbegrensning - 1860 |
A Treatise on Plane and Spherical Trigonometry: Including the Construction ... Enoch Lewis Uten tilgangsbegrensning - 1844 |
Vanlige uttrykk og setninger
ABDP angled spherical triangle base bisect c.cos c.sin centre circle Art common section Comp AC cone conical surface consequently construction cosec cosine cotan directrix distance drawn EC² ecliptic ED² ellipse equal equation given angle greater axis Hence hyperbola hypothenuse join latus rectum less circle Let ABC line of measures logarithms meet opposite ordinate original circle parabola parallel perpendicular plane of projection primitive circle projected circle projected pole projecting point Q. E. D. ART Q. E. D. Cor quadrant radius right angled spherical right ascension right line secant semicircle semitangent sides similar triangles sine sphere spherical angle tangent tangent of half touches the circle triangle ABC vertex vertical angle whence wherefore
Populære avsnitt
Side 32 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds.
Side 39 - In the same way it may be proved that a : b : : sin. A : sin. B, and these two proportions may be written a : 6 : c : : sin. A : sin. B : sin. C. THEOREM III. t8. 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. By Theorem II. we have a : b : : sin. A : sin. B.
Side 95 - TO THEIR DIFFERENCE ; So IS THE TANGENT OF HALF THE SUM OF THE OPPOSITE ANGLES', To THE TANGENT OF HALF THEIR DIFFERENCE.
Side 98 - In a right angled spherical triangle, the rectangle under the radius and the sine of the middle part, is equal to the rectangle under the tangents of the adjacent parts ; or', to the rectangle under the cosines of the opposite parts.
Side 40 - Def. 10. 1.) If then CE is made radius, GE is the tangent of GCE, (Art. 84.) that is, the tangent of half the sum of the angles opposite to AB and AC. If from the greater of the two angles ACB and ABC, there be taken ACD their half sum ; the remaining angle ECB will be their half difference.
Side 36 - The side of a regular hexagon inscribed in a circle is equal to the radius of the circle.
Side 115 - The straight line joining the vertex and the centre of the base is called the axis of the cone.
Side 97 - The cotangent of half the sum of the angles at the base, Is to the tangent of half their difference...
Side 82 - If two angles of a spherical triangle are equal, the sides opposite these angles are equal and the triangle is isosceles. In the spherical triangle ABC, let the angle B equal the angle C. To prove that AC = AB. Proof. Let the A A'B'C
Side 82 - If two triangles have two angles of the one respectively equal to two angles of the other, the third angles are equal.