T H E E L E M E N T S |
Book II Proposition 8 | |
Again, since BC is equal to BD, and GK to KN, therefore CK is also equal to KD, and GR to RN. [I.36] But CK is equal to RN, for they are complements of the parallelogram CP; [I.43] therefore KD is also equal to GR; therefore the four areas DK, CK, GR, RN are equal to one another. Therefore the four are quadruple of CK. |
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