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An oblong is that which has all its angles right angles, but has not all its sides equal.
Mensuration of lines, areas, surfaces, and volumes - Page xv
by Robert Rawson - 1856

Elements of Plane Geometry According to Euclid

Andrew Bell - Euclid's Elements - 1837 - 240 pages
...which has a right angle. 27. An obtuse-angled triangle is that which has an obtuse angle. _____ 29. Of four-sided figures, a square is that which has...its sides equal, and all its angles right angles. 30. An oblong or rectangle is that which has all its angles right angles, but has not all its sides...

The First Six and the Eleventh and Twelfth Books of Euclid's Elements: With ...

Euclid - Geometry - 1837 - 410 pages
...definitions of the square and rhombus which are given in Simeon's edition : " A square is a four-sided figure which has all its sides equal, and all its angles right angles. " A rhombus is a four-sided figure which has all its sides equal ; but its angles are not right angles."...

Elements of Geometry: Containing the First Six Books of Euclid : with a ...

John Playfair - Geometry - 1837 - 332 pages
...that which has all its sides equal and all its angles right angles. 26. An oblong is, that which hate all its angles right angles, but has not all its sides equal. / 28. A rhomboid, is that which has its opposite sides equal to one another, but all its sides are...

The Elements of Euclid

Euclid - Geometry - 1838 - 478 pages
...one another, which meet together, but are not in the same straight line. AD THE ELEMENTS OF EUCLID. XXXI. An oblong, is that which has all its angles right angles, but has not all its sides equal. XXXII. A rhombus is that which has its sides equal, but its angles are not right angles. xxxm. A rhomboid,...

Euclid's Elements [book 1-6] with corrections, by J.R. Young

Euclides - 1838 - 264 pages
...triangle have neither a right angle, nor an obtuse angle, . - \ al, its angles must be acute. XXVI. Of four-sided figures, a square is that which has...its sides equal, and all its angles right angles. This definition has been long known to be objectionable on the ground of its redundancy. More is said...

Elements of Mental Philosophy: Embracing the Two Departments of ..., Volume 1

Thomas Cogswell Upham - Intellect - 1839 - 476 pages
...brought out by a successive comparison of propositions. We say, for instance that a square is a figure, which has all its sides equal, and all its angles right angles. In this definition, there is not only involved equality of sides, but equality of angles. And it is...

First Lessons in Geometry: With Practical Applications in Mensuration, and ...

Charles Davies - Geometrical drawing - 1840 - 264 pages
...altitude. Thus, AC is the altitude. 14. There are several kinds of quadrilaterals. First. — The square, which has all its sides equal, and all its angles right angles. Of Plane Figures. Second. — The rectangle, which has its angles right angles, and its opposite sides...

First (Second) book of drawing (by J. Clark).

John Clark (drawing master.) - 1840 - 208 pages
...cross another ; where they touch is the point of intersection. The Square — A square is a figure which has all its sides equal, and all its angles right angles. The drawing of this figure requires the base line to be given, D on which points A and B, perpendiculars,...