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Area#Area formulas – Size of a two-dimensional surface; Perimeter#Formulas – Path that surrounds an area; List of second moments of area; List of surface-area-to-volume ratios – Surface area per unit volume; List of surface area formulas – Measure of a two-dimensional surface; List of trigonometric identities
giving the basic form of Brahmagupta's formula. It follows from the latter equation that the area of a cyclic quadrilateral is the maximum possible area for any quadrilateral with the given side lengths. A related formula, which was proved by Coolidge, also gives the area of a general convex
Dually, a square is the quadrilateral containing the largest area within a given perimeter. [18] Indeed, if A and P are the area and perimeter enclosed by a quadrilateral, then the following isoperimetric inequality holds: 16 A ≤ P 2 {\displaystyle 16A\leq P^{2}} with equality if and only if the quadrilateral is a square.
The wetted perimeter is the perimeter of the cross sectional area that is "wet". [1] The length of line of the intersection of channel wetted surface with a cross sectional plane normal to the flow direction.
With a land area of 4,299.8 km 2 (1,660.2 sq mi), it had a population density of 0.3/km 2 (0.7/sq mi) in 2021. [ 2 ] In the 2016 Census of Population conducted by Statistics Canada, Special Area No. 4 had a population of 1,237 living in 429 of its 471 total private dwellings, a change of -8.5% from its 2011 population of 1,352.
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