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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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Appletons' Cyclopædia of Drawing: Designed as a Text-book for the Mechanic ...

William Ezra Worthen - 1857 - 410 σελίδες
...as the angle at E.' 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 (fig. 3). An obtuse angle is that which is greater...

Appletons' Cyclopædia of Drawing: Designed as a Text-book for the Mechanic ...

William Ezra Worthen - 1857 - 410 σελίδες
...called a rig fit angle ; and the straight lines are said to be perpendicular to each other (fig. 3). An obtuse angle is that which is greater than a right angle (fig. 4). Fig. S. Fig. 4. Fig. B. Fig. 8. An acute angle is that which is less than a right angle (fig....

Gradations in Euclid : books i. and ii., with an explanatory preface [&c ...

Euclides - 1858
...line standing on another straight lino makes the adjacent angles equal to each other, each of these angles is called a right angle; and the straight line...stands on the other is called a perpendicular to it. The angle CD A being equal to angle CDB, each of them is a right angle, and CD is a perpendicular to...

Euclid's Elements of plane geometry [book 1-6] explicitly enunciated, by J ...

Euclides - 1860
...ABD, angle m. 11. 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. 12. The two adjacent angles which one straight line makes with another on the same side of it are called...

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

Robert Potts - 1860 - 361 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. XIL An acute angle is that which is...

Plane Trigonometry ...

Isaac Todhunter - 1860
...not in the same straight line. And when a straight line standing on another makes the adjacent angles equal to one another, each of the angles is called a right angle. A right angle is divided into 90 equal parts called degrees, a degree is divided into 60 equal parts...

A course of geometrical drawing

William Schofield Binns - 1861
...point, as c (10) " 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." The angles AB c, ABD, are right angles. Obs. 1. Because DB is in the same straight line with B c, the...

The young gardener's educator

William Keane (gardener.) - 1861
...ground on which they are built. 2. An acute (sharp) angle is that which is less than a right angle. 3. An obtuse angle is that which is greater than a right angle. 4. A circle is a plane figure bounded on all sides by a continued curve line called the circumference...

Euclid's plane geometry, books iii.-vi., practically applied; or, Gradations ...

Euclides - 1861
...st. line makes the adj. ¿_s equal to each other, each of these /.s is called a rt. ¿_ ; and the st. line which stands on the other is called a perpendicular to it. Ax. 1. Things which are equal to the same thing are equal to one another. EI 2 CI 2 Dat. Quass. Pst....

Euclid's Elements of geometry, books i. ii. iii. iv

Euclides - 1862
...adjacent angles. 5. 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; (def. 10.) 6. Therefore each of the angles DCF, ECF, is a right angle. Conclusion. — Therefore from...




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