 | Henry Martyn Taylor - 1893 - 486 pages
...opposite angles are equal. Let the two straight lines AB, CD intersect at E : it is required to prove that the angle AEC is equal to the angle DEB, and the angle CEB to the angle A ED. PROOF. The sum of the angles CEA, AED, which AE makes with CD on one side of it, is equal to... | |
 | Henry Martyn Taylor - Euclid's Elements - 1895 - 708 pages
...equal. Let the two straight lines AB, CD intersect at E : it is required to prove that the angle A EC is equal to the angle DEB, and the angle CEB to the angle AED. PROOF. The sum of the angles CEA, AED, which AE makes with CD on one side of it, is equal to two right... | |
 | Euclid - Mathematics, Greek - 1908 - 550 pages
...equal to one another. For let the straight lines AB, CD cut one another at the point E ; I say that the angle AEC is equal to the angle DEB, and the angle CEB to the angle AED. For, since the straight line AE stands on the straight line CD, making the angles CEA, AED, the angles... | |
 | Euclid - 454 pages
...equal to one another. For let the straight lines AB, CD cut one another at the point E ; SI say that the angle AEC is equal to the angle DEB, and the angle CEB to the angle AED. I For, since the straight line AE stands 10 on the straight line CD, making the angles CEA, AED, the... | |
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E, the adjacent angles CEA, AED; these angles are together equal to two right angles. (i. 13.) Again, because the straight line DE makes with AB... 
