The veil has ruptured allowing the mushroom's spores to float away. All that's left is the annulus right below the gills.
by DaShroomster November 16, 2020
Get the annulus mug.A geometric figure.
In mathematics, an annulus (the Latin word for "little ring", with plural annuli) is a ring-shaped geometric figure, or more generally, a term used to name a ring-shaped object. It is also used to describe the area between two concentric circles. The adjectival form is annular (for example, an annular eclipse).
The area of an annulus is the difference in the areas of the larger circle of radius R and the smaller one of radius r:
A = \pi R^2 - \pi r^2 = \pi(R^2 - r^2)\,.
In mathematics, an annulus (the Latin word for "little ring", with plural annuli) is a ring-shaped geometric figure, or more generally, a term used to name a ring-shaped object. It is also used to describe the area between two concentric circles. The adjectival form is annular (for example, an annular eclipse).
The area of an annulus is the difference in the areas of the larger circle of radius R and the smaller one of radius r:
A = \pi R^2 - \pi r^2 = \pi(R^2 - r^2)\,.
by David Faustino November 28, 2012
Get the Annulus mug.