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

John Playfair - Euclid's Elements - 1806 - 320 pages
...XXIV. _ Book I. An acute angled triangle is that which has three acute angles, i XXV. Of four sided figures, a square is that which has all its sides equal, and all its angles right angles. XXVI. An oblong is that which has all its angles right angles, but has not all its sides equal. XXVII....

The Elements of Euclid: Viz. the First Six Books, Together with the Eleventh ...

Euclid - Geometry - 1810 - 518 pages
...obtuse angle. XXIX. An acute-angled triangle, is that which has three acute angles. XXX. Of four sided figures, a square is that which has all its sides...which has all its angles right angles, but has not all Us sides equal. j\ j\ A, I 1 A rhombus, is that which has all its sides equal, but its angles are not...

The Eclectic review. vol. 1-New [8th], Volume 7, Part 2

1811 - 590 pages
...to Euclid s definition.' ' The change in def. 30 of Dr. Simson and 26 of the Professor, " an oblong has all its angles right angles, but has not all its sides equal," is but an uncouth expression; at least, it U not preferable to Euclid's def. 31. And in the Doctor's...

Elements of Crystallography: After the Method of Haüy; With, Or Without ...

Friedrich Christian Accum - Crystallography - 1813 - 396 pages
...equal to one another, and whose angles are right ones, as Fig. 2929 A rectangle is a parallelogram which has all its angles right angles, but has not all its sides equalr It is also called an oblong, being longer than broad. See Fig. 30. A rhombus, or lozenge, is...

Pantologia. A new (cabinet) cyclopędia, by J.M. Good, O. Gregory ..., Volume 5

John Mason Good - 1813 - 722 pages
...angled triangle, is that which ha* three arute angles. ” ' 50. Of four sided figures, asqnnre isthat which has all its sides equal, and all its angles right angles. 51. An oblong, is that which has all its angles right angles, Lu' has not all its sides equal. 32....

The Elements of Euclid; viz. the first six books, together with the eleventh ...

Euclides - 1814 - 558 pages
...which has an obtuse angle. XXIX. An acute angled triangle is that which has three acute angles. XXX. Of four-sided figures, a square is that which has...sides equal, and all its angles right angles. XXXI. v An oblong, is that which has all its angles right angles, but has not all its sides equal. XXXII....

The Elements of Euclid: Viz. the First Six Books, Together with the Eleventh ...

Euclides - 1816 - 528 pages
...which has an obtuse angle. XXIX. Anacute angled triangle is that. which has three acute angles, XXX. T Of four-sided figures, a square is that which has...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. XXX1II. ....

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

John Playfair - 1819 - 317 pages
...obtuse angle. XXIV. An acute angled triangle, is that which has three acute angles. XXV. Of four sided figures, a square is that which has all its sides equal, and all its angles right angles. XXVI. An oblong, is that which has all its angles right angles, but has not all its sides equal. i...