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“In geometry, Heron's (or Hero's) formula states that the area (A) of a triangle whose sides have...Heron's formula
“In geometry, Brahmagupta's formula finds the area of any quadrilateral given the lengths of the...Brahmagupta's formula
“Template:Otheruses1 Area is a quantity expressing the two-dimensional size of a defined part of...Area
“In geometry, Bretschneider's formula is the following expression for the area of a...Bretschneider's formula
“A circular sector or circle sector, is the portion of a circle enclosed by two radii and an arc...Circular sector