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annulus    
n. 环,轮,体环

环,轮,体环

annulus
n 1: a toroidal shape; "a ring of ships in the harbor"; "a halo
of smoke" [synonym: {ring}, {halo}, {annulus}, {doughnut},
{anchor ring}]
2: (Fungi) a remnant of the partial veil that in mature
mushrooms surrounds the stem like a collar [synonym: {annulus},
{skirt}]


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  • Annulus (mathematics) - Wikipedia
    In mathematics, an annulus (pl : annuli or annuluses) is the region between two concentric circles Informally, it is shaped like a ring or a hardware washer The word "annulus" is borrowed from the Latin word anulus or annulus meaning 'little ring'
  • Annulus - Definition, Formula, Examples - Cuemath
    An annulus is a two-dimensional flat figure shaped in a circular form which is constructed by two concentric circles The region or the area formed in between these two concentric circles is called the annulus
  • Annulus: Shape, Definition, Formulas - GeeksforGeeks
    An annulus is a flat, plane figure formed between two concentric circles, creating a ring-like shape The area of an annulus refers to the region enclosed between these two concentric circles, which lie in the same plane
  • Area of an annulus - Math Open Reference
    The area of the annulus is the area of the ring-shaped space between the two circles that define it In the figure above it is the number of gray square units it takes to fill the annulus This area is the area of the entire disk, minus the area of the 'hole' in the middle ( See Area of a Circle): Where:
  • Annulus - Math is Fun
    An annulus is a flat shape like a ring Its edges are two circles that have the same center The face of a metal washer is an annulus Something shaped like an annulus is said to be annular Because it is a circle with a circular hole, you can calculate the area by subtracting the area of the "hole" from the big circle's area:
  • Annulus Calculator
    Calculate the unknown areas, circumferences and radii of an annulus with any 2 known variables Online calculators and formulas for an annulus and other geometry problems
  • Understanding Annulus in Geometry – A Comprehensive Guide
    In geometry, the annulus stands as a captivating and intriguing geometric shape Defined as the region between two concentric circles, the annulus possesses a unique elegance that makes it visually appealing and mathematically significant
  • Annulus - Math. net
    An annulus (meaning little ring in Latin) is a ring-shaped figure between two concentric circles Below are two examples Think of an annulus as a circle with a concentric hole in it An annulus is something you've probably seen in your everyday life
  • Annulus Definition - BYJUS
    An annulus is a plane figure formed between two concentric circles (the circles sharing a common center) The shape of the annulus is like a ring Some of the real-life examples of annulus shape are finger-ring, dough-nut, a CD, etc
  • What is an Annulus in Geometry? - Interactive Mathematics
    In mathematics, an annulus is defined as the area between two circles that have the same center but different radii The area of an annulus can be calculated by subtracting the area of the smaller circle from the area of the larger circle





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