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Cor. 2. And consequently that all the angles made by any number of lines meeting in one point, are together equal to four right angles.
Instructions Given in the Drawing School Established by the Dublin Society ... - Page 29
by Joseph Fenn - 1769

## The Element of Geometry

John Playfair - Geometry - 1836 - 148 pages
...equal. Which was to be proved. COR. I. If two straight lines cut one another, the four angles" which they make at the point where they cut, are together equal to four right angles. COR. II. All the angles made by any number of straight lines, which meet in one point, are together...

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

Robert Simson - Geometry - 1838 - 434 pages
...Therefore, if two straight lines, &c. QED Cor. 1. From this it is manifest, that if two straight lines cut one another, the angles they make at the point where...they cut, are together equal to four right angles. Cor. 2. And consequently that all the angles made by any number of lines meeting in one point, are...

## Euclid's Elements [book 1-6] with corrections, by J.R. Young

Euclides - 1838 - 264 pages
...n. COR. 1. From th'is it is manifest, that, if two straight lines cut one another, the angles which they make at the point where they cut, are together equal to four right angles. COR. 2. And consequently that all the angles made by any number of lines meeting in one point, are...

## The Elements of Euclid; viz. the first six books,together with the eleventh ...

Euclides - Geometry - 1841 - 378 pages
...QED COR. 1. From this it is manifest, that, if two straight lines cut one another, the angles which they make at the point where they cut, are together equal to four right angles. PROP. XVI. THEOR. If one ride of a triangle be produced, the exterior angle is greater than either...

## Elements of geometry: consisting of the first four,and the sixth, books of ...

Euclides - 1842 - 316 pages
...QED COR. 1. From this it is manifest, that if two straight lines cut one another, the angles which they make at the point where they cut, are together equal to four right angles. COR. 2. And, consequently, that all the angles made by any number of lines meeting in one point, are...

## Euclid in Paragraphs: The Elements of Euclid: Containing the First Six Books ...

Euclid - Geometry - 1845 - 218 pages
...Therefore, if two straight lines, &c. QED COR. 1. From this it is manifest, that, if two straight lines cut one another, the angles they make at the point where...they cut, are together equal to four right angles. COR. 2. And consequently that all the angles made by any number of lines meeting in one point, are...

## Euclid's Elements of geometry [book 1-6, 11,12] with explanatory notes ...

Euclides - 1845 - 546 pages
...QED COR. 1. From this it is manifest, that, if two straight lines cut each other, the angles which they make at the point where they cut, are together equal to four right angles. COR. 2. And consequently that all the angles made by any number of lines meeting in one point, are...

## The Elements of Euclid, the parts read in the University of Cambridge [book ...

Euclides - 1846 - 292 pages
...Wherefore, If two straight lines Stc. QED COR. 1. From this it is manifest that, if two straight lines cut one another, the angles they make at the point where they cut are together equal to four right angles : COR. 2. And, consequently, that all the angles, made by any number of lines meeting in one point,...