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Basal area is the cross-sectional area of trees at breast height (1.3m or 4.5 ft above ground). It is a common way to describe stand density. In forest management, basal area usually refers to merchantable timber and is given on a per hectare or per acre basis. If one cut down all the merchantable trees on an acre at 4.5 feet (1.4 m) off the ...
Also acknowledged are claims of captive grey parrots reaching the ages of 73 and 93, [13] whereas the World Parrot Trust lists a longevity of 50–60 years for a grey in captivity. [14] The Guinness Book of World Records listed a grey parrot that allegedly lived in captivity for 72 years as the longest-lived specimen for the species. [15]
The formula for the surface area of a sphere is more difficult to derive: because a sphere has nonzero Gaussian curvature, it cannot be flattened out. The formula for the surface area of a sphere was first obtained by Archimedes in his work On the Sphere and Cylinder. The formula is: [6] A = 4πr 2 (sphere), where r is the radius of the sphere.
This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Converted to SVG using Inkscape, swapped axes to reflect US convention.. The original can be viewed here: Polygon area formula.jpg: . Modifications made by Nat2.
Γ is area preserving, Γ has a unique hyperbolic fixed point (the vertices of the square). The linear transformation which defines the map is hyperbolic: its eigenvalues are irrational numbers, one greater and the other smaller than 1 (in absolute value), so they are associated respectively to an expanding and a contracting eigenspace which ...
Hankinson's equation (also called Hankinson's formula or Hankinson's criterion) [1] is a mathematical relationship for predicting the off-axis uniaxial compressive strength of wood. The formula can also be used to compute the fiber stress or the stress wave velocity at the elastic limit as a function of grain angle in wood .
In geometric measure theory the area formula relates the Hausdorff measure of the image of a Lipschitz map, while accounting for multiplicity, to the integral of the Jacobian of the map. It is one of the fundamental results of the field that has connections, for example, to rectifiability and Sard's theorem .
Parrs Wood House is an 18th-century Georgian villa in the Parrs Wood area of Didsbury, Manchester, England. It was described by Pevsner as "a poorer man's Heaton Hall ." [ 2 ] It was designated a Grade II* listed building on 25 February 1952.