Books Books 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 principles of Euclid: an introduction to the study of the first book ...

T S. Taylor - 1880 - 152 pages
...lines to any point .in CD and join A B.) A D DEFINITION OF RIGHT ANGLES. JTigr.J. Euc. Def. io.) — When a straight line, .standing on another straight...the straight line •which stands on the other is -A. -0 .* said to be perpendicular to it. Thus the straight line CD is said to stand on the straight... ## Class lessons on Euclid

Marianne Nops - 1882 - 278 pages
...smaller than a right angle, called acute (Lat. acutus, sharp). These are thus defined by Euclid : — 10. ' When a straight line standing on another straight...stands on the other is called a perpendicular to it.' 11. 'An obtuse angle is that which is greater than a right angle.' 12. 'An acute angle is that which... ## The Elements of Euclid for the Use of Schools and Colleges: Comprising the ...

Euclid, Isaac Todhunter - Euclid's Elements - 1883 - 426 pages
...only one angle at a point, it may be expressed by a letter placed at that point; as the angle at E. 10. When a straight line standing on another straight...stands on the other is called a perpendicular to it. 11. An obtuse angle is that which is greater than a right angle. 12. An acute angle is that which \... ## An introduction to the Elements of Euclid, being a familiar explanation of ...

Stephen Thomas Hawtrey - 1884 - 186 pages
...leads on to the Definitions 10, 11, and 12 of Euclid, which are as follows : Definition 10.—When a straight line standing on another straight line...stands on the other is called a perpendicular to it. Definition}.}..—An obtuse angle is that which is greater than a right angle. Definition 12.—An... ## Stewart's specific subjects. Euclid. [1st] (-3rd stage). [With 2 issues of ...

Stewart W. and co - 1884 - 272 pages
...but are not in the same straight line. An angle is named from three or one letters, as ABC or B. X. When a straight line standing on another straight...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 Elements of Euclid, books i. to vi., with deductions, appendices and ...

Euclides - 1884 - 434 pages
...a straight line stands on another straight line, and makes the adjacent angles equal to each other, each of the angles is called a right angle ; and the...stands on the other is called a perpendicular to it. CUD Thus, if AB stands on CD in such a manner that the adjacent angles ABC, ABD are equal to one another,... ## The text of Euclid's geometry, book 1, uniformly and systematically arranged ...

Euclides - 1884 - 214 pages
...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...stands on the other is called a perpendicular to it. PROPOSITION XIII. THEOREM. The angles which one straight line makes with another straight line on one... ## An introduction to geometry, consisting of Euclid's Elements, book ..., Volume 1

Euclides - 1884 - 182 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. 11. An obtuse angle is that which is greater than a right angle. 12. An acute angle is that which is... ## Mathematical Questions with Their Solutions: From the ..., Volumes 40-42

1884 - 434 pages
...bine 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." Let us then take two sets of such lines and apply one to tjie other, so that the feet of the perpendiculars... 