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" The area of a rectangle is equal to the product of its base and altitude. Given R a rectangle with base b and altitude a. To prove R = a X b. Proof. Let U be the unit of surface. .R axb U' Then 1x1 But - is the area of R. "
A Treatise on Mensuration, Both in Theory and Practice - Page 91
by Charles Hutton - 1788 - 703 pages
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SAT Testbuster: REA's Testbuster for the Scholastic Assessment Test with ...

Robert Andrew Bell, Research and Education Association - Study Aids - 1999 - 448 pages
...the shaded region is equal to the area of rectangle ABCD minus the area of triangle EBC. Recall that the area of a rectangle is equal to the product of its length and its width. Thus, Area of rectangle ABCD = (AB) (BC) 1 The area of any triangle is equal to ^ times...
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