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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. "
The first book of Euclid's Elements, simplified, explained and illustrated ... - Σελίδα 6
των Euclides - 1847
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The Elements of Euclid for the Use of Schools and Colleges: Comprising the ...

Euclid, Isaac Todhunter - 1867 - 400 σελίδες
...BDG. [I. 8. But 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 ; [I. Definition 10. therefore the angle BDG is a right angle. But the angle BDF is also a right angle....

Euclid's Elements of Geometry: Chiefly from the Text of Dr. Simson, with ...

Robert Potts - 1868 - 410 σελίδες
...line standing on another straight line, makes the adjacent angles equal to one another, each of these angles is called a right angle ; and the straight...stands on the other is called a perpendicular to it. XL An obtuse angle is that which is greater than a right angle. XII. An acute angle is that which is...

Modern Methods in Elementary Geometry

E. M. Reynolds - 1868 - 112 σελίδες
...line standing on another straight line makes the adjacent angles equal to one another, each of these angles is called a right angle; and the straight line which stands on the other is said to be perpendicular to it. We acquire a clear idea of'the magnitude of an angle by supposing it...

Mensuration for Beginners: With Numerous Examples

Isaac Todhunter - 1869 - 296 σελίδες
...angle ; and so on. 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. Thus, in the figure, if the angle ABC is equal to the angle ABD each of them is a right angle, and...

Elements of geometry, containing the first two (third and fourth ..., Μέρος 1

Euclides - 1871
...IX. When a straight line (as AS) meeting another straight line (as CD) makes the A adjacent angles equal to one another, each of the angles is called a RIGHT ANGLE; and each line is said to be a PEEPENDICULAB to the other. c X. An OBTUSE ANGLE is one which is greater...

The Teachers' Companion to the American Drawing-slates and Cards ...

Walter Smith - 1872 - 44 σελίδες
...Three Lines: Angles and Triangles. DIVISION a. ANGLES. DEFINITIONS. — No. 1. A right angle. No. 2. An obtuse angle is that which is greater than a right angle. No. 3. An acute angle is that which is less than a risjht OO angle. The dotted line shows a right angle...

The Acting Teacher's and Student's in Training Guide and Text Book for ...

Henry Major - 1873
...letters, as ABC or B. X. When a straight line standing oil another straight line makes the adjacent angles equal to one another, each of the angles is called...and the straight line which stands on the other is _ called a perpendicular to it. XI. An obtuse angle is greater than a right angle. XII. An acute angle...

The Quadrature of the Circle: The Square Root of Two, and the Right-angled ...

William Alexander Myers - 1873 - 164 σελίδες
...standing on another straight line makes the adjacent angles equal to one another, each of the angles is a right angle, and the straight line which stands on the other is called a perpendicular to it; IKL arc perpendiculars to the line GH. PLATE 1. DEFINITIONS OF LINES AND ANGLES AA B H ,r ' V X £...

The Elements of Euclid, containing the first six books, with a selection of ...

Euclides - 1874
...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...angle is that which is greater than a right angle. / 18. An acute angle is that which is less than a right angle. 13. A term or boundary is the extremity...

Pure mathematics, Τόμος 1

Edward Atkins - 1874
...eHF^CHG But when a straight line, standing on another straight are "l""1line, makes the adjacent angles equal to one another, each of the angles is called...stands on the other is called a perpendicular to it (Def. 10). Therefore, from the given point C, a perpendicular has been drawn to the given straight...




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