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. to a sphere, § 564. of contact of a plane tangent to a sphere, § 564. Points symmetrical with respect to a line, § 387. symmetrical with respect to a point, § 386. Polar distance of a circle of a Ratio, § 180. triangles, § 592. Reciprocally proportional magni- Rectangle, § 105. Rectangular parallelopiped, § 474. Poles of a circle of a sphere, § 567. Rectilinear figure, § 12. Polyedral angle, § 452. Polyedron, § 461. Re-entrant angle, § 121. Regular polyedron, § 536. |