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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. 11. An obtuse angle...
The elements of geometry, in eight books; or, First step in applied logic - Pagina 143
door L J V. Gerard - 1874
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## The Young Mathematician's Guide: Being a Plain and Easy Introduction to the ...

John Ward - 1747 - 480 pagina’s
...is, AC, and C J5, are Perpendicular to £> C, as well as -D, C is to /•j'r/W or both of them. g. An OBTUSE ANGLE is that which is greater than a Right Angle. Such is the Angle included between the Lines AC and n CB. 10. An ACUTE ANGLE is that ^_ which is lefs...
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## The First Six Books: Together with the Eleventh and Twelfth

Euclid - 1781 - 520 pagina’s
...angle ; and the ftraight line which ftands on the other is called a perpendicular to it. XI. An obtufe angle is that which is greater than a right angle. ,. An acute angle is that which is lefs than a right angle. > '.'XIII. , •i. ;. " A term or boundary is the extremity of any thing."...
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## The philosophical and mathematical commentaries of Proclus ... on the first ...

...and the infifting Right Line, is called a PERPENDICULAR to that upon which it ftands. DEFINITION Xf. An OBTUSE ANGLE is that which is greater than a RIGHT ANGLE. DEFINITION XII. But an ACUTE ANGLE, is that which is Icfs than a RIGHT ANGLE, THESE are the triple...
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## The shipwright's vade-mecum [by D. Steel].

David Steel - 1805
...is the angle of ABC. " I An (tht use Angle is that which is greater than a right A ' angle, as ABC. An Acute Angle is that which is less than a right angle, asDBC. By an ANGLE of ELEVATION is meant the angle contained between a line of direction, and any plane...
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## A New and Enlarged Military Dictionary: Or, Alphabetical Explanation of ...

Charles James - 1805 - 1006 pagina’s
...side, and consequently the arches intercepted either way are equal to 90°, or the quarter of a circle. An Acute ANGLE, is that which is less than a right angle, or 90°. An Obtuse ANCLE, is that whicb is greater than a right angle. Adjacent ANGLES, are such as...
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## The Tutor's Guide, Being a Complete System of Arithmetic: With Various ...

Charles Vyse - 1806 - 320 pagina’s
...placed at the Angular Point being always wrote in the Middle, as ADC (Fig. 4. denotes the Angle I. An Obtuse Angle is that which is greater than a right Angle, as CAB, (Fig 3.; An acute Angle is that which is less than a right Angle, »s DCB, (Fig. 4.) A Superficies...
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## The Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago ...

Robert Simson - 1806 - 518 pagina’s
...right angle ; and the straight line which 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 is less than a right anp-Ic. • XIII. rt A term or boundary is the...
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## Elements of Geometry: Containing the First Six Books of Euclid, with a ...

John Playfair - 1806 - 311 pagina’s
...and the straight line which stands on the other is called a perpendicular to it. _____ VIII, Book I. An obtuse angle is that which is greater than a right angle. IX. An acute angle is that which is less than a right angle. X. A figure is that which is inclosed...
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## Geometrical and Graphical Essays: Containing a General Description of the ...

George Adams - 1813 - 534 pagina’s
...three letters, that placed at the angular point being always in the middle ; as B is the angle of ABC. An obtuse angle is that which is greater than a right...acute angle is that which is less than a right angle. A line AB, Jig, 2, plate 4, cutting another line CD in E, will make the opposite angles equal, namely,...
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## The Elements of Euclid; viz. the first six books, together with the eleventh ...

Euclides - 1814
...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 is less than a right angle. Xlll. " A term or boundary is th\$ extremity of any thing." XIV. A figure is that which is inclosed...
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