H
E
E
L
E
M
E
N
T
S
the exterior angle EGB equal to the interior and opposite angle GHD,
or
the interior angles on the same side, namely BGH, GHD, equal to two right angles;
I say that AB is parallel to CD.
|
T H E E L E M E N T S |
Book I Proposition 28 | |
|
For let the straight line EF falling on the two straight lines AB, CD make the exterior angle EGB equal to the interior and opposite angle GHD, or the interior angles on the same side, namely BGH, GHD, equal to two right angles; I say that AB is parallel to CD. |
|
|
| Return to Propositions Next Page | ||