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الكتب الكتب 121 - 122 من 122 فيWhen a straight line standing on another straight line makes the adjacent angles....
" When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a right angle; and the straight line which stands on the other is called a perpendicular to it. "
The Elements of Euclid: Viz. the First Six Books, with the Eleventh and ... - الصفحة 10
بواسطة Alexander Ingram - 1799 - عدد الصفحات: 351
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The Thirteen Books of Euclid's Elements: Tr. from the Text of Heiberg

Euclid - 1926
...ptifav opOrji. 12. "O£«ia Si 17 l\ti<T(Tu>v 6p6rj<;. v- 10. fffo/ia straight line set up on a straight line makes the adjacent angles equal to one another, each of the equal angles is right, anil the straight line standing on the other is called a perpendicular to that...
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The Thirteen Books of Euclid's Elements

Euclid
...therefore the angle AFE is equal to the angle BFE. [i. 8] But, when a straight line set up on a straight line makes the adjacent angles equal to one another, each of the equal angles is right ; [i. Def. 10] 20 therefore each of the angles AFE, BFE is right. Therefore CD,...
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