H
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For, since
GBEA is a parallelogram,
and
the angle AEB is right,
therefore
the angle AGB is also right. [I.34]
Similarly we can prove that
the angles at H, K, F are also right.
Therefore
FGHK is right-angled.
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T H E E L E M E N T S |
Book IV Proposition 7 | |
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I say next that it is also right-angled. For, since GBEA is a parallelogram, and the angle AEB is right, therefore the angle AGB is also right. [I.34] Similarly we can prove that the angles at H, K, F are also right. Therefore FGHK is right-angled. |
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