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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 Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago ... - Side 2
av Robert Simson - 1781 - 466 sider
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Appletons' Cyclopædia of Drawing: Designed as a Text-book for the Mechanic ...

William Ezra Worthen - 1857 - 410 sider
...letter placed at that point ; 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 rig fit angle ; and the straight lines are said to be perpendicular to each other (fig. 3). An obtuse...
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Euclid's Elements of plane geometry [book 1-6] explicitly enunciated, by J ...

Euclides - 1860
...DBC may be called angle n ; and 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 a right angle ; and the straight line which stands on the other is called a perpendicular to it. 12. The two adjacent angles...
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Plane Trigonometry ...

Isaac Todhunter - 1860
...meet together, but are 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...
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Euclid's Elements of Geometry: Chiefly from the Text of Dr. Simson, with ...

Robert Potts - 1860 - 361 sider
...angle ADG is equal to the angle GDB : (I. 8.) but when a straight line standing upon another straight line makes the adjacent angles equal to one another, each of the angles is a right angle ; (I. def. 10.) therefore the angle GDB is a right angle : but FDB is likewise a right...
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A course of geometrical drawing

William Schofield Binns - 1861
...meeting or cutting each other in a 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 a right angle; and the straight line which stands on the other is called a perpendicular to it." The angles AB c, ABD, are...
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Euclid's Elements of geometry, books i. ii. iii. iv

Euclides - 1862
...ECF; (I. 8.) And they are 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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The school Euclid: comprising the first four books, by A.K. Isbister

Euclides - 1862
...ADG must be equal to the angle GDB ; (L, 8) but ' when a straight line standing upon another straight line makes the adjacent angles equal to one another, each of the angles is a right angle;' (i. def. 10) therefore the angle GDB must be a right angle ; but FOB is a right angle;...
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The school edition. Euclid's Elements of geometry, the first six books, by R ...

Euclides - 1864
...angle ADG is equal to the angle GDB : (I. 8.) but when a straight line standing upon another straight line makes the adjacent angles equal to one another, each of the angles is a right angle ; (I. def. 10.) therefore the angle GDB is a right angle : but FDB is likewise a right...
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The College Euclid: Comprising the First Six and the Parts of the Eleventh ...

Euclides - 1865
...ECF; (i. 8) and they are adjacent angles. 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) therefore each of the angles DCF, ECF, is a right angle. Wherefore, from the point C,...
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The Elements of Euclid for the Use of Schools and Colleges: Comprising the ...

Euclid, Isaac Todhunter - 1867 - 400 sider
...angle ADG is equal to the angle 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....
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