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Published online by Cambridge University Press: 03 November 2016
Area Of a Rectangle.—Consider a rectangle A of height h and base b (Fig. 18). By moving the rectangle so that its base slides along the x-axis through a distance b, it takes up the second position A. Thus, on a length 26 of the x-axis, commencing at O, we have a rectangle of height h and area 2A, and so on.