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I. Book II. V E R Y right angled parallelogram is said to be contain. \----- ed by two right lines containing the right angle.

. In every parallelogram, either of the two parallelograms that are about the diameter, together with the complement, is called a gnomon.

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If there be two right lines, and one of them divided into any number of parts, the reëtangle contained by the whole, and di.

vided line, is equal to all the rectangles contained by the whol:

line, and the several parts of the divided line.

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