## Elements of plain and spherical trigonometry: together with the principles of spherick geometry, and the several projections of the sphere in plano. The whole demonstrated and illustrated with useful cases and examples |

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Angled Triangles Angular Point Axiom Azimuth Base Cafe Center Chords Circles of Longitude Co-Sine Complement consequently cuts the Plain DEMONSTRATION describe the Circle Difference draw the Diameter draw the Line Ecliptick Elevation Ellipsis equal Arks Equinoctial fall fame manner gent half Tangent Half-Tangent Horizon Hour Circles Hypothenuse intersect Latitude Legs Lemma lesser Circle LExicon Technicum likewise Line of Mea Line of Measures Logarithm number of Degrees oblique Circle oblique Projection opposite Angles Parallels of Declination pass thro pendicular perpendicular Plain Triangles Polar Circles primitive Circle PROB Quadrant Radius rallel represent Representation Required right Angles right Ascension right Circle right Lines Right-angled Triangles rizon Secant Sides Sphere Spherical Angle Spherical Triangles subtend Suns suppose ther Trigonometry Tropick Versed Sine wherefore Zenith

### Popular passages

Page 164 - The law of sines states that in any spherical triangle the sines of the sides are proportional to the sines of their opposite angles: sin a _ sin b __ sin c _ sin A sin B sin C...

Page 41 - As the base or sum of the segments Is to the sum of the other two sides, So is the difference of those sides To the difference of the segments of the base.

Page 163 - BD ; the co-fine of the angle B will be to the co-fine of the angle D, as the fine of the angle BCA to the fine of the angle DCA. For by 22. the co-fine of the angle B is to the fine of the angle...

Page 11 - If either of the legs, including the right angle, be made the radius of a circle, the other leg will be the tangent of its oppofite angle, and the hypothenufe the fecant of the fame angle, E For TRIGONOMETRY.

Page 35 - In any plane triangle, the sum of tfte two sides containing either angle, is to their difference, as the tangent of half the sum of the other two angles, to the tangent of half their difference.

Page 40 - Sum of fs'' \ the Legs, as the Difference of the Legs is to the Difference of the Segments of the Bafe made by a Perpendicular let fall from the Angle oppofite to the Bafe.

Page 170 - Angle oppoflte call the Bafe ; then work as in the nth Cafe. For fuch is the Operation in the Supplemental Triangle, whofe Angles and Sides are equal to the Supplements of the Sides and Angles of the Triangle propnk'd ; and Arcs and their Supplements have the fame Sines and Tangents.

Page 60 - Projeftiott the Angles made by the Circles on the Surface of the Sphere are equal to the Angles made by their Reprefentatiyes on the plane of the Projection.

Page 38 - FA : FG ; that is in Words, half the Sum of the Legs is to half their Difference, as the Tangent of half the Sum of the oppofite Angles is to the Tangent of half their Difference : But Wholes are as their Halves ; wherefore the Sum of the Legs...

Page 162 - OBlique Spherical Triangles may be reduced to two Right-angled Spherical Triangles, by letting fall a Perpendicular, which Perpendicular eiPlate V.