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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.
Recto tono is a Latin phrase used in the context of church liturgy and music. Recto tono has been described as "the simplest form of church music, a reciting tone. One note held for the length of a phrase." [1] It literally means "straight" or "uniform" tone. In liturgical chanting, recto tono is used to recite without embellishment or ...
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.
A right circular hollow cylinder (or cylindrical shell) is a three-dimensional region bounded by two right circular cylinders having the same axis and two parallel annular bases perpendicular to the cylinders' common axis, as in the diagram. Let the height be h, internal radius r, and external radius R.
An example of a spherical cap in blue (and another in red) In geometry, a spherical cap or spherical dome is a portion of a sphere or of a ball cut off by a plane.It is also a spherical segment of one base, i.e., bounded by a single plane.
The standard 1-torus is just the circle: T 1 = S 1. The torus discussed above is the standard 2-torus, T 2. And similar to the 2-torus, the n-torus, T n can be described as a quotient of R n under integral shifts in any coordinate. That is, the n-torus is R n modulo the action of the integer lattice Z n (with the action being taken as vector ...
In this context a toroid need not be circular and may have any number of holes. A g-holed toroid can be seen as approximating the surface of a torus having a topological genus, g, of 1 or greater. The Euler characteristic χ of a g holed toroid is 2(1-g). [2] The torus is an example of a toroid, which is the surface of a doughnut.
Perimeter is the distance around a two dimensional shape, a measurement of the distance around something; the length of the boundary. A perimeter is a closed path that encompasses, surrounds, or outlines either a two dimensional shape or a one-dimensional length.