T H E E L E M E N T S |
Book II Proposition 4 | |
CGKB was shown to be equilateral and and also right-angled; therefore CK is a square; and it is described on CB. For the same reason HF is also a square; and it is described on HG, that is AC. [I.34] Therefore the squares HF, CK are the squares on AC, CB. |
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