## A Treatise on Spherics: Comprising the Elements of Spherical Geometry, and of Plane and Spherical Trigonometry, Together with a Series of Trigonometrical Tables |

### Inni boken

Side 3

A Sphere is a solid figure contained by one surface ,

A Sphere is a solid figure contained by one surface ,

**and is such that all straight lines , drawn from a certain point within the figure to the**surface , are equal to one another : ( 2. ) And this point is called the Center of the ...### Hva folk mener - Skriv en omtale

Vi har ikke funnet noen omtaler på noen av de vanlige stedene.

### Andre utgaver - Vis alle

### Vanlige uttrykk og setninger

applied arch base bisect called chords circumference common section complement consequently construction contained conversely cosine describe describe a circle diameter distance draw drawn equal equal circles equations evident express extremity fall figure fore Forms four functions given arch given circle given point given sphere greater half Hence hypotenuse hypothesis Introd isosceles join known less lesser circle manifest manner means measure meet method parallel pass perpendicular plane polar distance pole Problem produced PROP proposed proposition proved quadrant radius remaining respectively right angles segments semi-circumference shewn sine solution solved species sphere's center sphere's surface spherical angle spherical triangle straight line supposed tangent Theorem third three angles three sides touch touch the circle triangle ABC wherefore

### Populære avsnitt

Side 58 - If two triangles have two angles of the one equal to two angles of the other, each to each, and one side equal to one side, viz. either the sides adjacent to the equal...

Side 50 - BC shall be equal to the base EF ; and the triangle ABC to the triangle DEF ; and the other angles, to which the equal sides are opposite, shall be equal, each to each, viz.

Side iii - A circle is a plane figure contained by one line, which is called the circumference, and is such, that all straight lines drawn from a certain point within the figure to the circumference are equal to one another.

Side 43 - Theorem. If two spherical triangles on the same sphere, or on equal spheres, are equilateral with respect to each other, they are also equiangular with respect to each other.

Side 60 - If two triangles have one angle of the one equal to one angle of the other and the sides about these equal angles proportional, the triangles are similar.

Side 58 - BC common to the two triangles, which is adjacent to their equal angles ; therefore their other sides shall be equal, each to each, and the third angle of the one to the third angle of the other, (26.

Side iii - A diameter of a circle is a straight line drawn through the center and terminated both ways by the circumference, as AC in Fig.

Side 146 - If two triangles have two sides and the included angle in the one equal to two sides and the included angle in the other, each to each, the two triangles will be equal.

Side 38 - THEOREM. The sum of the sides of a spherical polygon is less than the circumference of a great circle.

Side 54 - If two angles of a triangle be equal to one another, the sides also which subtend the equal angles shall be equal to one another.