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the alternate angles AGH, GHD equal,
the exterior angle EGB equal to the interior and opposite angle GHD,
and
the interior angles on the same side, namely BGH, GHD, equal to two right angles.
Being what it was required to prove.
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T H E E L E M E N T S |
Book I Proposition 29 | |
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Therefore, if straight line EF fall on the parallel straight lines AB, CD, it makes the alternate angles AGH, GHD equal, the exterior angle EGB equal to the interior and opposite angle GHD, and the interior angles on the same side, namely BGH, GHD, equal to two right angles. Being what it was required to prove. |
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