## A Course of Mathematics: In Three Volumes : Composed for the Use of the Royal Military Academy ...J. Johnson, 1811 |

### From inside the book

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**measured**from that Point , will be equal to the Square of the Semi - axis to which it is .. parallel . That is , the rect . HEK or Heк = Ca2 , and rect . hek or hek CA2 . E D F For , draw AL parallel to ca , and aL to CA. by the ... Page 59

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**measured**by an arc greater than a quadrant ) has the same sine and cosine as its supplement ; the cosine however , being reckoned sub- tractive or negative , because it is situated contrariwise with regard to the centre c . When the ... Page 70

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**measured**by arcs constituting a semicircle . So that , if radius be considered as unity , we shall find that , the sum of the tangents of the three angles of any plane triangle , is equal to the continued product of those tangents ... Page 80

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**measured**on the surface of the sphere , is the a great circle pass- ing through these points . arc of THEOREM II . The Sum of the Three Sides of any Spherical Triangle îs Less than 360 degrees . For , let the sides AC , BC , ( fig . to ... Page 82

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**measured**on an arc of a great circle ) will be 90 ° ; also , since c is the pole of the arc EF , the points c and E will be 90 ° distant conse- quently ( art . 8 ) the point E is the pole of the arc ac . In like manner it may be shown ...### Other editions - View all

### Common terms and phrases

abscissas altitude ANHG asymptotes axis ball base beam becomes bisect CA² CE² centre circle circumscribed coefficients cone conic section consequently Corol cosine cubic equation curve cylinder DE² denote determine diameter distance divided draw drawn equa equal equation expression feet find the fluent fluxion force greatest Hence horizontal hyperbola inches length logarithm manner measured meridian motion nearly ordinates parabola parallel perimeter perpendicular plane polygon prism prob PROBLEM proportional quadrant quantity radius rectangle resistance right angles right line roots Scholium sides sin² sine solid angle sphere spherical angle spherical excess spherical triangle spherical trigonometry square suppose surf surface tangent theor THEOREM theref tion trapezium velocity vertical weight whence whole

### Popular passages

Page 63 - 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.

Page 114 - Since the exterior angle of a triangle is equal to the sum of the two interior opposite angles (th.

Page 247 - Or, by art. 3 14 of the same, the pressure is equal to the weight of a column of the fluid, •whose base is equal to the surface pressed, and...

Page 80 - A solid angle is that which is made by the meeting of more than two plane angles, which are not in the same plane, in one point. X. ' The tenth definition is omitted for reasons given in the notes.

Page 333 - ... to secure uniformity, his trees were all felled in the same season of the year, were squared the day after, and the experiments tried the 3d day.

Page 164 - Cor. 3. An equation will want its third term, if the sum of the products of the roots taken two and two, is partly positive, partly negative, and these mutually destroy each other. Remark.

Page 162 - ... preceding equation is only of the fourth power or degree ; but it is manifest that the above remark applies to equations of higher or lower dimensions : viz. that in general an equation of any degree whatever has as many roots as there are units in the exponent of the highest power of the unknown quantity, and that each root has the property of rendering, by its substitution in place of the unknown quantity, the aggregate of all the terms of the equation equul to nothing.

Page 72 - Prove that, in any plane triangle, the base is to the difference of the other two sides, as the sine of half the sum of the angles at the base, to the sine of half their difference : also, that the...

Page 259 - And when this is compared with the proportion of the velocity and length of gun in the last paragraph, it is evident that we gain extremely little in the range by a great increase in the length of the gun, with the same charge of powder. In fact the range is nearly as the 5th root of the length of the bore ; which is so small an increase, as to amount only to about a...

Page 72 - Prob. 12. How must three trees, A, B, C, be planted, so that the angle at A may be double the angle at B, the angle at B double the angle at C, and a line of 400 yards may just go round them ? Ans.