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at right angles to a given straight line, from a given point in the same. Prop. 13. The angles which one straight line makes with another upon one side of it, are either two right angles, or are together equal to two right angles. Prop. 14. If, at a point...
The school Euclid: comprising the first four books, by A.K. Isbister - Σελίδα ii
των Euclides - 1863
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## Instructions Given in the Drawing School Established by the Dublin Society ...

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...PROPOSITION XIII. THEOREM VI. HE angles which one ftraight line EC makes with another ЛВ upon pre fide of it, are either two right angles, or are together equal to two right angles. Hypothefls. Thefis. EC is aßraighl line meeting I. Either each of V ACE, ECB, is a L.. AB in the faint...

## The Elements of Euclid, Viz: The Errors, by which Theon, Or Others, Have ...

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...was to be done. PROP. XIII. THEO R. angles which one ftraight line makes with another upon one ftde of it, are either two right angles, or are together equal to two right angles - Def. t. Book I. Let the ftraight line AB make with CD, upon one fide, of it, the angles CBA, ABD...

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## Elements of Geometry;: Containing the First Six Books of Euclid, with Two ...

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...PROP. XIII. THEO R. THE angles which one ftraight line makes with another upon the one fide of it, arc either two right angles, or are together equal to two right angles. Let the ftraight line AB make with CD, upo" one fide of it, the angles CBA, ABD ; thefe arc either...

## The Elements of Euclid: Viz. the First Six Books, with the Eleventh and ...

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...be done. PROP. XIII. THEOR. THE angles which one ftraight line makes with another upon the one fide of it, are either two right angles, or are together equal to two right angles. Let the flraight line AB make with CD, upon one- fide of it, the BooK I. the angles CBA, ABD ; thefe...

## The Elements of Euclid: Also the Book of Euclid's Data ...cor. viz. The ...

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...l. Let the ftraight line AB make with CD, upon one fide of it, v —v ' the angles CBA, ABD; thefe are either two right angles, or are together equal to two right angles. a. Def. 10. For if the angle CBA be equal to ABD, each of them is a right » AE _^___ DB a b. ii. i....

## The Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago ...

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...into two equal parts in the point D. Which was to be done. PROP. XI. PROB. TO draw a straight line at right angles to a given straight line, from a given point in the same. See N. Let AB be a given straight line, and Ca point given in it; it is required to draw a straight...

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...THE ELEMENTS Let the straight line AB make with CD, upon one side of it, the angles CBA, ABD; these are either two right angles, or are together equal to two right angles. For, if the angle CBA be equal to ABD, each of them is a AEA D B CD II C right " a.igle; but, if not,...