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. Elements of Geometry and Conic Sections - Page 10
by Elias Loomis - 1857 - 226 pages ## Geometry for schools, comprising books i. and ii. of Euclid, with some ...

Euclides - 1883 - 176 pages
...(/. 8), and .-. L DCF = L ECF, and these 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. .-. CF is at right angles to AB, and is drawn from the given point... ## Relfe brothers' Euclid sheets, propositions 1-26, book 1

Euclides - 1884 - 94 pages
...the angle is equal to the angle ; and these are adjacent angles. But when a straight line standing on another straight line, makes the adjacent angles equal to one another, each of them is a right angle, and the straight line which stands upon the other is called a perpendicular to it. Therefore... ## Mathematical Questions with Their Solutions: From the ..., Volumes 40-42

1884 - 434 pages
...capable of proof. The definition of a right angle is as follows : " When a straight 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 line which stands on the other is called a... ## The text of Euclid's geometry, book 1, uniformly and systematically arranged ...

Euclides - 1884 - 214 pages
...contained by the two sides equal to them of the other. Definition 10. When a straight line standing on another straight line makes the adjacent angles equal to one another, each of these angles is called a right angle. COROLLARY TO PROPOSITION XI. By the help of this proposition... ## Stewart's specific subjects. Euclid. [1st] (-3rd stage). [With 2 issues of ...

Stewart W. and co - 1884 - 290 pages
...line. An angle is named from three or one letters, as ABC or B. X. 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... ## The Weston school manual

Colin Arrott R. Browning - 1884 - 274 pages
...point. (4) When a straight line standing on another straight line makes the adjacent angles equal, each of them is called a Right Angle ; and the straight line standing on the other is called a Perpendicular, or said to be at right angles to it. (5) A Square... ## Mathematical Questions and Solutions, Volume 42

Mathematics - 1885 - 150 pages
...capable of proof. The definition of a right angle is as follows : " When a straight 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 called a... ## Elementary Physiography: An Introduction to the Study of Nature

John Thornton - Physical geography - 1888 - 266 pages
...— Euclid gives the following definition of a right angle : — ' 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... ## Practical Surveying: A Text-book for Students Preparing for Examinations Or ...

George William Usill - Surveying - 1889 - 306 pages
...of, a plane rectilineal angle is always meant. 4. Perpendicular, — When a straight 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 lines are said to be perpendicular to each other.... 