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A rhombus is that which has all its sides equal, but its angles are not right angles.
The First Six Books with Notes - Page 3
by Euclid - 1822 - 179 pages

The philosophical and mathematical commentaries of Proclus ... on the first ...

...and material imperfection, DEFINITION XXX. Of Quadrilateral Figures, a QUADRANGLE or SQUARE is that which has all its Sides equal, and all its Angles Right Angles. DEFINITION XXXI. i An OBLONC is that which has all its Angles right Angles, but has not all its Skies...

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

John Playfair - Euclid's Elements - 1806 - 311 pages
...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: The Errors, by which Theon, Or Others, Have Long Ago ...

Robert Simson - Trigonometry - 1806 - 518 pages
...angled triangle is that which has three acute angles. XXX. Of four sided figures, a square is that which has all its sides equal, and all its angles right angles. XXXI. Aii oblong is that which has all its angles right angles, but has not all its sides equal. XXXII....

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

John Mason Good - 1813
...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 - 1816 - 528 pages
...angled triangle is that. which has three acute angles, XXX. T Of four-sided figures, a square is that which has all its sides equal, and all its angles right angles. XXXI. An oblong, is that which has all its angles right angles, but has not all its sides equal. XXXII....

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

John Playfair - 1819 - 317 pages
...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...

Universal Technological Dictionary: Or, Familiar Explanations of ..., Volume 2

George Crabb - Industrial arts - 1823
...of four sides. The principal of these figures are as follow : namely — The square, ie a foursided figure, which has all its sides equal, and all its angles right angles, as ABCD, fig. 13. — An oblong square, a figure having all its angles right angles, but not all its...

Hints to Parents ...: No. I[-VI], Issues 1-6

Education - 1825
...essential mathematical figures, The mother draws quadilateral figures of four equal sides. A four-sided figure which has all its sides equal, and all its angles right angles, is called a square. Try whether the square I have drawn is correct. She makes three squares of equal,...