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 Βιβλία Βιβλία 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 first book of Euclid's Elements, simplified, explained and illustrated ... - Σελίδα 6
των Euclides - 1847
Πλήρης προβολή - Σχετικά με αυτό το βιβλίο ## Lessons on Form: Or, An Introduction to Geometry, as Given in a Pestalozzian ...

Charles Reiner - 1837 - 215 σελίδες
...each other, each of them is called a right angle. 11. All right angles are equal to each other. 12. An obtuse angle is that which is greater than a right angle. 13. An acute angle is that which is less than a right angle. 14. All obtuse angles are not equal to... ## Euclid's Elements [book 1-6] with corrections, by J.R. Young

Euclides - 1838
...the angle at E.VIII. 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 lines are said to be perpendicular to each other. IX. An obtuse angle is that which is greater than... ## First (Second) book of drawing (by J. Clark).

...by the number of degrees which it contains, or its proportion of the circum-c ference of a circle. An Obtuse Angle is that which is greater than a right angle, thus, An Acute Angle is that which is less than a right angle, thus, The Equilateral Triangle is a... ## The Elements of Euclid; viz. the first six books,together with the eleventh ...

Euclides - 1841 - 351 σελίδες
...' angle at E." X. When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called...stands on the other is called a perpendicular to it. XI. XII. An acute angle is that which is less ^\ than a right angle. X>. XIII. " A term or boundary... ## Elements of geometry: consisting of the first four,and the sixth, books of ...

Euclides - 1842
...the angle at E.' X. When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called...stands on the other is called a perpendicular to it. XI. An obtuse angle is that which is greater than a right angle. XII. An acute angle is that which... ## Elements of Geometry: Containing the First Six Books of Euclid, with a ...

John Playfair - 1842 - 317 σελίδες
...the 'angle at E.' 7. When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called...stands on the other, is called a perpendicular to it 8. An obtuse angle is that which is greater than a right angle. 9. An acute angle is that which is... ## A course of practical geometry for mechanics

William Pease - 1843 - 68 σελίδες
...great circles. X. When a straight line standing on another straight line, makes the adjacent angles equal to one another, each of the angles is called...stands on the other is called a perpendicular to it. Beginners are apt to suppose that a perpendicular, must be a vertical, or plumb line, which it need... ## Lectures on the Principles of Demonstrative Mathematics

Philip Kelland - 1843 - 147 σελίδες
...trigonometers often make it. 7. When a straight line standing on another makes the adjacent angles equal to one another, each of the angles is called...stands on the other is called a perpendicular to it. By looking over the propositions of Euclid's first Book it will be seen that the only definitions which... ## Euclid's Elements of geometry [book 1-6, 11,12] with explanatory notes ...

Euclides - 1845
...line standing on another straight line makes the adjacent angles equal to each other, each of these angles is called a right angle ; and the straight...stands on the other is called a perpendicular to it. XI. An obtuse angle is that which is greater than a right angle. XII. An acute angle is that which... ## Euclid in Paragraphs: The Elements of Euclid: Containing the First Six Books ...

Euclid - 1845 - 199 σελίδες
...angle ' at E.' X. 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 tine which stands on the other is called a perpendicular to it. XI. An obtuse angle is that which is...