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the exterior angle EGB equal to the interior and opposite angle GHD,
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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 28 | |
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Therefore, if 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, Being what it was required to prove. |
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