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In Euclidean plane geometry, a rectangle is a quadrilateral with four right angles. It can also be defined as an equiangular quadrilateral, since equiangular means that all of its angles are equal.
Area = basis * height
A = a * b =
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"Rectangle Area" Math @ STANDS4. STANDS4 LLC, 2018. Web. 20 Oct. 2018. <http://math.stands4.com/calculators/rectangle-area>.