EA : and because AD is equal to DC, and DE common to the triangles ADE, CDE, the two sides AD, DE are equal to the two CD, DE, each to each ; and the angle ADE is equal to the angle CDE, for each of them is a right angle ; therefore the base AE is equal... The Elements of Euclid: With Dissertations Intended to Assist and Encourage ...  Page 88 by Euclid, James Williamson  1781  309 pages Full view 
