A Treatise on Spherics: Comprising the Elements of Spherical Geometry, and of Plane and Spherical Trigonometry, Together with a Series of Trigonometrical TablesJ. Mawman, 1816 - 294 páginas |
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... theorem , which in order to be understood , requires very little knowledge of what is called Spherical Geo- metry . Any extensive study of that subject might , therefore , appear to be a needless labour . But it may be urged , on the ...
... theorem , which in order to be understood , requires very little knowledge of what is called Spherical Geo- metry . Any extensive study of that subject might , therefore , appear to be a needless labour . But it may be urged , on the ...
Página iii
... theorem , which in order to be understood , requires very little knowledge of what is called Spherical Geo- metry . Any extensive study of that subject might , therefore , appear to be a needless labour . But it may be urged , on the ...
... theorem , which in order to be understood , requires very little knowledge of what is called Spherical Geo- metry . Any extensive study of that subject might , therefore , appear to be a needless labour . But it may be urged , on the ...
Página v
... down , are founded on theorems : it would , therefore , have been preposterous to have announced them , before the propositions , upon which they are dependent , had been proved . The definitions themselves have been very PREFACE .
... down , are founded on theorems : it would , therefore , have been preposterous to have announced them , before the propositions , upon which they are dependent , had been proved . The definitions themselves have been very PREFACE .
Página vi
... theorems , have recourse to certain graphical operations , which , are to be per- formed in the interior of the solid sphere . Now , although in establishing the truth of a theorem , there vi PREFACE .
... theorems , have recourse to certain graphical operations , which , are to be per- formed in the interior of the solid sphere . Now , although in establishing the truth of a theorem , there vi PREFACE .
Página vii
... theorem , there seems to be no impropriety , in supposing such operations to have been executed , whenever they are evidently or demonstrably possible , and although , in demonstrating spherical theorems , there is often a kind of ...
... theorem , there seems to be no impropriety , in supposing such operations to have been executed , whenever they are evidently or demonstrably possible , and although , in demonstrating spherical theorems , there is often a kind of ...
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Términos y frases comunes
angle opposite base bisect circle EFH circumference co-tangent common section cosine describe a circle describe Art diameter drawn equal and parallel equal arches equal circles equal spheres equal to FE equations Euclid's Elements Find Art fore four right angles given angle given arch given circle given great circle given point given sphere given triangle greater hypotenuse Introd join Art less measure meet oblique angles opposite angle parallel circles perpendicular plane triangle polar distance polar triangle pole Problem PROP proposition quadrantal triangle radius rical triangle right angles right-angled spherical triangle SCHOLIUM semi-circumference shewn side BC sin S sin sine sphe sphere's center sphere's surface spherical angle spherical distance Spherical Geometry spherical polygon spherical tri Spherical Trigonometry straight line tangent Theorem three angles three sides touch the circle triangle ABC trigonometrical functions wherefore
Pasajes populares
Página 53 - 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...
Página 46 - 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.
Página 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.
Página 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.
Página 53 - 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.
Página 53 - 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.
Página 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.
Página 132 - 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.
Página 38 - THEOREM. The sum of the sides of a spherical polygon is less than the circumference of a great circle.
Página 50 - 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.