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altitude angle ABC angle ACB angle BAC bisect centre chord circ circular sector circumference circumscribed polygon coincide cone consequently convex surface cylinder denote diagonal diameter dicular distance draw equal and parallel equal angles equiangular equilateral triangle equivalent exterior angle figure formed given line greater half the arc inscribed circle intersection isosceles join less Let ABC line AC line CD lines drawn measured by half meet multiplied number of sides parallel lines parallelogram parallelopipedon pendicular perimeter perpen perpendicular plane MN point G prism Problem produced Prop PROPOSITION pyramid radii radius rectangle regular polygon respectively equal right-angled triangle Schol Scholium scribed semicircle semicircumference side AC similar similar triangles solid angle sphere spherical polygon spherical triangle square straight line suppose tangent Theorem three sides triangle ABC triangular prism vertex VIII
Page 231 - THE sphere is a solid terminated by a curve surface, all the points of which are equally distant from a point within, called the centre.
Page 17 - 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.
Page 28 - If two sides and the included angle of the one are respectively equal to two sides and the included angle of the other...
Page 233 - The volume of a cylinder is equal to the product of its base by its altitude. Let the volume of the cylinder be denoted by V, its base by B, and its altitude by H.
Page 276 - THEOREM. Two triangles on the same sphere, or on equal spheres, are equal in all their parts, when they have each an equal angle included between equal sides. Suppose the side...
Page 120 - The areas of two triangles which have an angle of the one equal to an angle of the other are to each other as the products of the sides including the equal angles. D c A' D' Hyp. In triangles ABC and A'B'C', ZA = ZA'. To prove AABC = ABxAC. A A'B'C' A'B'xA'C' Proof. Draw the altitudes BD and B'D'.
Page 18 - If equals be added to unequals, the wholes are unequal. V. If equals be taken from unequals, the remainders are unequal. VI. Things which are double of the same, are equal to one another.
Page 232 - A spherical triangle is a portion of the surface of a sphere, bounded by three arcs of great circles.