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The axis of a cone is the straight line passing through the apex about which the cone has a circular symmetry. In common usage in elementary geometry, cones are assumed to be right circular, i.e., with a circle base perpendicular to the axis. [1] If the cone is right circular the intersection of a plane with the lateral surface is a conic section.
A set C and its dual cone C *. A set C and its polar cone C o.The dual cone and the polar cone are symmetric to each other with respect to the origin. Dual cone and polar cone are closely related concepts in convex analysis, a branch of mathematics.
For a given volume, the right circular cylinder with the smallest surface area has h = 2r. Equivalently, for a given surface area, the right circular cylinder with the largest volume has h = 2 r , that is, the cylinder fits snugly in a cube of side length = altitude ( = diameter of base circle).
Recto is the "right" or "front" side and verso is the "left" or "back" side when text is written or printed on a leaf of paper (folium) in a bound item such as a codex, book, broadsheet, or pamphlet. In double-sided printing , each leaf has two pages – front and back.
The rectovesical pouch is a space between the rectum and the bladder in men. [1] It lies above the seminal vesicles. [2] It is lined by peritoneum and at its base is the rectoprostatic fascia (Denonvillier's fascia).