A treatis on spherics, Page 2121816 |
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angle opposite base bisect circle EFH circle of latitude 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 side given sphere given triangle greater hypotenuse Introd join Art less meet oblique angles opposite angle parallel circles perpendicular plane triangle polar distance polar triangle pole Problem PROP proposition radius 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 tri Spherical Trigonometry straight line tanē tangent Theorem three angles three sides touch the circle triangle ABC trigonometrical functions wherefore