H
E
E
L
E
M
E
N
T
S
therefore
AB, CD, if produced indefinitely, will meet;
but
they do not meet, because they are by hypothesis parallel.
Therefore
the angle AGH is not unequal to the angle GHD,
but
is equal to it.
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T H E E L E M E N T S |
Book I Proposition 29 | |
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But straight lines produced indefinitely from angles less than two right angles meet; [Post.5] therefore AB, CD, if produced indefinitely, will meet; but they do not meet, because they are by hypothesis parallel. Therefore the angle AGH is not unequal to the angle GHD, but is equal to it. |
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