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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 ## An Introduction to Mensuration and Practical Geometry

John Bonnycastle - 1829 - 252 σελίδες
...are perpendicular to each other.* 11. An acute angle is that which is less than a right angle. 12. An obtuse angle is that which is greater than a right angle. PRACTICAL GEOMETRY. 15 13. A circle is a plane figure, formed by the revolution of a right line about... ## An Introduction to Geography and the Use of the Globes, for the Use of Schools

James Charlton - 1829 - 230 σελίδες
....,; . l 5tn"A f itei,*& i theinc!ination or opening -of two angles is called a RIGHT ANGLE ; and the line which stands on the other, is called a PERPENDICULAR to it. •• • > i •••••• i OF THE TERRESTRIAL •'CLdME.'"' 28. The TERRESTRIAL GLOBE is an... ## Geometry Without Axioms; Or the First Book of Euclid's Elements. With ...

Thomas Perronet Thompson - 1833 - 150 σελίδες
...is meant. XXXVII. 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 ; and is also said to be at right angles to it. XXXVIII. An angle greater than a right angle, is called... ## The First Six Books of the Elements of Euclid: With Notes

Euclid - 1833 - 183 σελίδες
...(ABC and ABD) equal to one another, each of these angles is called a right angle ; B and the right line, which stands on the other, is called a perpendicular to it. Fig. 1. 12. The angle (ABC), which is greater than a right angle, is called obtuse. Fig. 4. 13. The... ## The Elements of Euclid: Viz. the First Six Books, Together with the Eleventh ...

Euclid - 1835 - 513 σελίδες
...angle at E.' X. When a straight line standing on another straight line makes the adja- • cent 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... ## The Teacher's Assistant in the "Course of Mathematics Adapted to the Method ...

1836 - 472 σελίδες
...straight line. 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... ## Elements of Geometry: Containing the First Six Books of Euclid, with a ...

John Playfair - 1836 - 471 σελίδες
...a straight line standing on another straight line makes the adjacent angles equal to one an, other, each of the angles is called a right angle; and the straight line which stands on the other ie called a perpendicular to it. , VIII. An obtuse angle is that which is greater than a right angle.... ## The First Six and the Eleventh and Twelfth Books of Euclid's Elements: With ...

Euclid, James Thomson - 1837 - 390 σελίδες
...vertex of the angle. 8. 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, and is said to be at right angles to it. 9. An obtuse angle is that / which is greater than a right... ## Treatise on Arithmetic, in Theory and Practice: With an Appendix, Containing ...

James Thomson (LL.D.) - 1837 - 284 σελίδες
...When one straight line standing on another, makes with it two angles which are equal, each of these angles is called a RIGHT ANGLE ; and the straight line which stands on the other is said to be PERPENDICULAR, Or AT RIGHT ANGLES, tO it, or tO be a PERPENDICULAR to it. III. An OBTUSE... ## Remarks on Mathematical Or Demonstrative Reasoning: Its Connexion with Logic ...

Edward Tagart - 1837 - 135 σελίδες
...of two straight lines to one another, which meet together but are not in the same straight line." " An obtuse angle is that which is greater than a right angle." With what propriety can it be said that these are hypotheses? An hypothesis is that mode of accounting...