T H E E L E M E N T S |
Book III Proposition 2 | |
Then, since DA is equal to DB, the angle DAE is also equal to the angle DBE. [I.5] And, since one side AEB of the triangle DAE is produced, the angle DEB is greater than the angle DAE [I.16] But the angle DAE is is equal to the angle DBE; therefore the angle DEB is greater than the angle DBE. |
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