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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.
A course of geometrical drawing - Page 2
by William Schofield Binns - 1861

## First Stage Practical Plane and Solid Geometry

G. F. Burn - Geometry - 1903 - 272 pages
...standing on another straight line makes the adjacent angles equal ' pjg. 5. to one another, each of these angles is called a right angle; and the straight line...stands on the other is called a perpendicular to it. Parallel lines are such that, if produced ever so far both ways, do not meet. The complement of an...

## Ellen: Or, Whisperings of an Old Pine, Volume 1

Joseph Battell - Force and energy - 1903 - 722 pages
...straight line standing on another straight line makes the adjacent angles equal to one another, the angle is called a right angle ; and the straight line which...stands on the other is called a perpendicular to it.' "Ellen notices another error in a remark under this definition, viz. : 'When a straight line is perpendicular...

## A Text-book of Euclid's Elements for the Use of Schools, Book 1

Euclid - Euclid's Elements - 1904 - 488 pages
...said to be vertically opposite. The two angles CEB, AED are also vertically opposite to one another. 10. When a straight line standing on another straight...stands on the other is called a perpendicular to it. 1 1 . An obtuse angle is an angle which is greater than a right angle. 12. An acute angle is an angle...

## Modern Sheet-metal Workers' Instructor: Practical Geometry, Mensuration ...

Joseph H. Rose - Sheet-metal work - 1906 - 340 pages
...in a plane which meet together, but are not in the same straight line as in Fig. 1. Fig. 1. Fig. 2. When a straight line, standing on another straight...stands on the other is called a perpendicular to it as in Fig. 2. GEOMETEIIAI A tine s Ls-^ri "w^i Th? ai/K "..« if i : A straigfe: extreme p:ira». A...

## Encyclopedia of Engineering: A Treatise on Boilers, Steam Engines ..., Volume 7

Calvin Franklin Swingle - Engineering - 1906 - 490 pages
...a plane which meet together, bnt are not in the same straight line as in Fig. 34. Fi(. 34. Fig 35. When a straight line, standing on another straight...stands on the other is called a perpendicular to it as in Fig 35. Fig. 38. An obtuse angle is that which is greater than a right angle as in Fig. 36. An...

## Practical Mechanical Drawing and Machine Design, Self Taught ...

Charles Westinghouse - Machine design - 1906 - 168 pages
...to one another in a plane which meet together, but are not in the same straight line as in Fig. 34. When a straight line, standing on another straight...stands on the other is called a perpendicular to it as in Fig. 35. An obtuse angle is that which is greater than a right angle as in Fig. 36. Fig. 36....

## The advanced class-book of modern geography, by W. Hughes and J.F. Williams ...

William Hughes - 1908 - 942 pages
...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 line...stands on the other is called a perpendicular to it. An Obtuse Angle is greater, and an Acute Angle is less, than a right angle. A Term or Boundary is the...

## Standard American Cyclopedia of Steam Engineering: A Treatise on the Care ...

Calvin Franklin Swingle - Steam engineering - 1913 - 1270 pages
...a plane which meet together, but are not in the same straight line as in Fig. 34. Fig. 34. Fig. 35. When a straight line, standing on another straight...stands on the other is called a perpendicular to it as in Fig 35. Fig. 36. An obtuse angle is that which is greater than a right angle- as in Fig. 36....