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Geometrical Illustrations of Algebraic Identities

Published online by Cambridge University Press:  31 October 2008

Peter Comrie
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All these identities may be proved after one method as follows:—

Draw two straight lines at right angles and mark off parts a and b as indicated in the figures. At the points of section draw perpendiculars to the lines. All the figures thus formed are rectangles, and therefore have their opposite sides equal. The proofs should then be obvious.

Type
Research Article
Information
Edinburgh Mathematical Notes , Volume 3 , December 1909 , pp. 27 - 29
Copyright
Copyright © Edinburgh Mathematical Society 1909