Extremes of a proportion, § 229. Indirect method of proof, § 50. Face angles of a polyedral angle, Inscriptible polygon, § 151. § 452. Faces of a diedral angle, § 428. of a polyedral angle, § 452. of a polyedron, § 461. Figure symmetrical with respect to a centre, § 390. Interior angles, § 71. Inversion, § 236. Isoperimetric figures, § 378. symmetrical with respect Lateral area of a cone, § 647. to an axis, § 391. Figures symmetrical with respect to a centre, § 388. symmetrical with respect to an axis, § 388. Foot of a line, § 397. of a pyramid inscribed in a frustum of a cone, of a cylinder, § 638. of a frustum of a cone, of a prism, § 466. of a pyramid, § 502. Lateral edges of a prism, § 466. Lateral faces of a prism, § 466. of a pyramid, § 502. Locus of a series of points, § 141. § 181. polygons, § 599. tangent to a cone, § 553. circle, § 151. about a inscribed in a circle, § 151. Postulate, § 15. Prism, § 466. circumscribed about a cylin- der, § 639. inscribed in a cylinder, Problem, § 15. Projection of a line on a line, § 276. of a line on a plane, of a point on a line, of a point on a plane, § 447. tangent to a cylinder, § 540. Proportion, § 227. tangent to a frustum of a Proposition, § 15. to a circle, § 149. Pyramid, § 502. circumscribed about a cone, § 648. inscribed in a cone, § 648. pyramid, § 503. of contact of a line tangent Quadrangular prism, § 469. Quadrant, § 146. Radius of a circle, § 142. of a regular polygon, § 341. Polar distance of a circle of a Ratio, § 180. Poles of a circle of a sphere, § 567. Rectilinear figure, § 12. Polyedral angle, § 452. Polyedron, § 461. Re-entrant angle, § 121. Regular polyedron, § 536. Segment of a circle, § 147. Segments of a line by a point, § 250. Semicircle, § 147. Semi-circumference, § 146.. Sides of a polygon, § 118. of a quadrilateral, § 103. of a spherical polygon, § 587. of an angle, § 20. Similar arcs, § 369. cones of revolution, § 555. polyedrons, § 527. polygons, § 252. sectors, § 369. segments, § 369. Slant height of a cone of revolu- tion, § 647. of a frustum of a cone of revolution, § 647. divided in extreme parallel to a plane, perpendicular to a plane, § 397. tangent to a sphere, Straight lines divided proportion- Subtended arc, § 147. Supplement of an angle, § 30. of a frustum of a regu- Supplementary-adjacent of an arc, § 190. angles, lar pyramid, § 511. of a regular pyramid, § 33. § 508. Surface, § 2. |