Trigonometry, Plane and Spherical: With the Construction and Application of LogarithmsKimber and Conrad, 1810 - 125 páginas |
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Página 14
... given angle C ( see fig . 8. ) is less than the given side BC , ad- jacent to it ( except the angle found be exactly a right one ) : for then another right line Ba , equal to BA , may be drawn from B to a point in the base , somewhere ...
... given angle C ( see fig . 8. ) is less than the given side BC , ad- jacent to it ( except the angle found be exactly a right one ) : for then another right line Ba , equal to BA , may be drawn from B to a point in the base , somewhere ...
Página 27
... points at the distance of a semicircle , or 180 degrees . 2. It also appears ( from Def . 2. ) that all great circles , passing through the pole of a given circle , cut that circle at right angles ; because they pass through or coincide ...
... points at the distance of a semicircle , or 180 degrees . 2. It also appears ( from Def . 2. ) that all great circles , passing through the pole of a given circle , cut that circle at right angles ; because they pass through or coincide ...
Página 99
... a semicircle's distance , all great circles passing through G must cut at the opposite point H ; and therefore their centres must be in the line RDS . 2. E. D. COROLLARY I. Hence , also , if any oblique circle GLH be required to make any ...
... a semicircle's distance , all great circles passing through G must cut at the opposite point H ; and therefore their centres must be in the line RDS . 2. E. D. COROLLARY I. Hence , also , if any oblique circle GLH be required to make any ...
Página 105
... given cutting planes fall on the opposite sides of the third plane , and ... point ; any two right lines EP , FP drawn through P will intercept the ... point , will cut off equal arcs of those circles , and these planes will intersect the ...
... given cutting planes fall on the opposite sides of the third plane , and ... point ; any two right lines EP , FP drawn through P will intercept the ... point , will cut off equal arcs of those circles , and these planes will intersect the ...
Página 110
... a given dis- tance from its pole . RULE . Draw two diameters to the primitive AB , DE ( fig . 59. ) , at right angles to each other . Set the distance of the pa- rallel from the pole opposite the projecting point , on the pri- mitive ...
... a given dis- tance from its pole . RULE . Draw two diameters to the primitive AB , DE ( fig . 59. ) , at right angles to each other . Set the distance of the pa- rallel from the pole opposite the projecting point , on the pri- mitive ...
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Términos y frases comunes
ABDP AC by Theor adjacent angle arch bisecting chord circle passing co-sine AC co-tangent of half common logarithm common section Comp describe the circle E. D. COROLLARY E. D. PROP equal to half extremes gent given angle given circle given point half the difference half the sum half the vertical Hence hyperbolic logarithm hypothenuse inclination intersect leg BC line of measures original circle parallel perpendicular plane of projection plane triangle ABC primitive PROB produced projected circle projected pole projecting point radius rectangle right line right-angled spherical triangle SCHOLIUM secant semi-tangents sides similar triangles sine 59 sine AC sine of half sphere spherical angle SPHERICAL PROJECTIONS spherical triangle ABC sum or difference tangent of half THEOREM THOMAS SIMPSON triangle ABC fig versed sine vertical angle whence
Pasajes populares
Página 69 - TO THEIR DIFFERENCE ; So IS THE TANGENT OF HALF THE SUM OF THE OPPOSITE ANGLES', To THE TANGENT OF HALF THEIR DIFFERENCE.
Página 79 - ... projection is that of a meridian, or one parallel thereto, and the point of sight is assumed at an infinite distance on a line normal to the plane of projection and passing through the center of the sphere. A circle which is parallel to the plane of projection is projected into an equal circle, a circle perpendicular to the plane of projection is projected into a right line equal in length to the diameter of the projected circle; a circle in any other position is projected into an ellipse, whose...
Página 25 - The cotangent of half the sum of the angles at the base, Is to the tangent of half their difference...
Página 28 - The rectangle of the radius, and sine of the middle part, is equal to the rectangle of the tangents of the two EXTREMES CONJUNCT, and to that of the cosines of the two EXTREMES DISJUNCT.
Página 7 - If the sine of the mean of three equidifferent arcs' dius being unity) be multiplied into twice the cosine of the common difference, and the sine of either extreme be deducted from the product, the remainder will be the sine of the other extreme. (B.) The sine of any arc above 60°, is equal to the sine of another arc as much below 60°, together with the sine of its excess above 60°. Remark. From this latter proposition, the sines below 60° being known, those...
Página 28 - 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.