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

Proclus (Diadochus.) - 1788 - 350 pages
...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...
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Elements of Geometry: Containing the First Six Books of Euclid, with a ...

John Playfair - Mathematics - 1806 - 320 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....
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The Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago ...

Robert Simson - Trigonometry - 1806 - 546 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....
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Pantologia. A new (cabinet) cyclopędia, by J.M. Good, O. Gregory ..., Volume 5

John Mason Good - 1813 - 714 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....
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The Elements of Euclid: Viz. the First Six Books, Together with the Eleventh ...

Euclides - 1816 - 588 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....
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Elements of Geometry: Containing the First Six Books of Euclid: With a ...

John Playfair - 1819 - 354 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...
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Universal Technological Dictionary: Or, Familiar Explanations of ..., Volume 2

George Crabb - Industrial arts - 1823 - 704 pages
...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...
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Hints to Parents ...: No. I[-VI], Issues 1-6

Education - 1825 - 498 pages
...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,...
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A Popular Course of Pure and Mixed Mathematics ...: With Tables of ...

Peter Nicholson - Mathematics - 1825 - 1046 pages
...acute-angled triangle ”s that which has three acute anglesSO. Of four-sided figures, a square is that which has all its sides equal, and all its angles right angles. 31. An oblong, is that which has all its angles right angles, but has not all its sides equal. 32....
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Elements of Arithmetic, Algebra, and Geometry

George Lees - 1826 - 276 pages
...triangle, is that which has three acute angles. Book I. XXVI. — Of four sided figures, a square is that which has all its sides equal, and all its angles right angles. XXVII. — An oblong, is that which has all its angles right angles, but has not all its sides equal....
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