Trigonometry, Plane and Spherical: With the Construction and Application of LogarithmsKimber and Conrad, 1810 - 125 páginas |
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Página 6
... right line drawn from one extremity of an arch to the other : thus the right line BE is the chord , or subtense , of the arch BAE or BDE . 6. The sine , or right sine , of an arch is a right line drawn from one extremity of the arch ...
... right line drawn from one extremity of an arch to the other : thus the right line BE is the chord , or subtense , of the arch BAE or BDE . 6. The sine , or right sine , of an arch is a right line drawn from one extremity of the arch ...
Página 14
... right one ) : for then another right line Ba , equal to BA , may be drawn from B to a point in the base , somewhere between C and the perpendicular BD , and therefore the angle found by the pro- portion AB ( aB ) : sin . C :: BC : sin ...
... right one ) : for then another right line Ba , equal to BA , may be drawn from B to a point in the base , somewhere between C and the perpendicular BD , and therefore the angle found by the pro- portion AB ( aB ) : sin . C :: BC : sin ...
Página 26
... right line passing through the centre of the sphere , perpendicular to the plane of the circle and the two points , where the axis intersects the sur- face of the sphere , are called the poles of the circle . 3. A spherical angle is the ...
... right line passing through the centre of the sphere , perpendicular to the plane of the circle and the two points , where the axis intersects the sur- face of the sphere , are called the poles of the circle . 3. A spherical angle is the ...
Página 35
... line CF bisecting the vertical angle . DEMONSTRATION . It will be ( by Cor . to Theor . 3. ) , co - sine A : co ... right - angled spherical SPHERICAL TRIGONOMETRY . 35.
... line CF bisecting the vertical angle . DEMONSTRATION . It will be ( by Cor . to Theor . 3. ) , co - sine A : co ... right - angled spherical SPHERICAL TRIGONOMETRY . 35.
Página 88
... line of measures of any circle , is the common sec- tion of the plane of projection and another plane which pas- ses through the axes of the primitive and of that circle . 6. The right line drawn from any point on the sphere to the ...
... line of measures of any circle , is the common sec- tion of the plane of projection and another plane which pas- ses through the axes of the primitive and of that circle . 6. The right line drawn from any point on the sphere to the ...
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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.