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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.
Elements of geometry, based on Euclid, book i - Page 23
by Edward Atkins - 1877

## The Acting Teacher's and Student's in Training Guide and Text Book for ...

Henry Major - Student teachers - 1873 - 588 pages
...named from three or one letters, as ABC or B. X. When a straight line standing oil another straight line makes the adjacent angles equal to one another,...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 Quadrature of the Circle: The Square Root of Two, and the Right-angled ...

William Alexander Myers - Circle-squaring - 1873 - 238 pages
...; *that is, having a common center, as at F. 14. When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is a right angle, and the straight line which stands on the other is called a perpendicular to it; IKL...

## Pure mathematics, Volume 1

Edward Atkins - 1874 - 428 pages
...are adjacent angles. eHF^CHG But when a straight line, standing on another straight are "l""1line, makes the adjacent angles equal to one another, each...straight line AB. QEF Proposition 13.— Theorem. The angles which one straight line makes with another upon (me side of it, are either two right angles,...

## Pure mathematics, Volume 1

Edward Atkins - 1874 - 426 pages
...by the letter at that point, as the angle E. 10. When a straight line standing on another straight line makes the adjacent angles equal to one another,...stands on the other is called a perpendicular to it. 1 1 . An obtuse angle is that which is greater than a right angle. 12. An acute angle is that which...

## A school Euclid, being books i. & ii. of Euclid's Elements, with notes by C ...

Euclides - 1874 - 120 pages
...angle 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. Therefore from the giveu point...

## The Quadrature of the Circle: The Square Root of Two, and the Right-angled ...

William Alexander Myers - Circle-squaring - 1874 - 207 pages
...circles ; that is, having a common center, as at F. 14. When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is a right angle, and the straight line which stands on the other is called a perpendicular to it; IKL...

## The Elements of Euclid, containing the first six books, with a selection of ...

Euclides - 1874 - 342 pages
...cmgle 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 2. The angle GDB is a right angle ; but FDB is likewise a right...

## Modern geometry [ed.] with an appendix by W.B. Jack

Richard Wormell - 1876 - 268 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 which stands on the other is said to be perpendicular to it. 19. When one straight line meeting another straight line makes the...

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

Robert Potts - Geometry - 1876 - 446 pages
...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...

## Elements of geometry, based on Euclid, books i-iii

Edward Atkins - 1876 - 130 pages
...is equal to tho angle BDG (I. 8). .•_. But when a straight line, standing on another straight ~z line, makes the adjacent angles equal to one another, each of the angles ia called a right angle (I. Def. 10). Suppose G the centre. Therefore the angle GDB is a right angle....