Books Books 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: consisting of the first four,and the sixth, books of ...

Euclides - 1842 - 320 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...angles right angles, but has not all its sides equal. XXXII. A rhombus is that which has all its sides equal, but its angles are not right angles. XXXIII.... ## Elements of Geometry: Containing the First Six Books of Euclid, with a ...

John Playfair - Euclid's Elements - 1842 - 332 pages
...obtuse angle. 24. An acute angled triangle is that whick has three acute angles. 25. Of four sided figures, a square is that which has all its sides equal and all its angles right angles. 26. An oblong is that which has all its angles right angles, but has not all its sides equal. 27. A... ## A course of practical geometry for mechanics

William Pease - Geometry - 1843 - 80 pages
...which has an obtuse angle. The two remaining angles will necessarily be acute. XXX. Of four -sided figures, a square is that which has all its sides...angles right angles, but has not all its sides equal. Its opposite sides are necessarily equal. XXXII. A rhombus is that which has all its sides equal, but... ## Lectures on the Principles of Demonstrative Mathematics

Philip Kelland - Algebra - 1843 - 168 pages
...figures as contain more sides than angles, such as A., which are called by Zenodorus * In Def. 27. Of four-sided figures a square is that which has all its sides equal, and one of its angles a right angle. It has been properly objected to some of Euclid's definitions, that... ## Euclid's Elements of geometry [book 1-6, 11,12] with explanatory notes ...

Euclides - 1845 - 544 pages
...triangle is that which has three acute angles. XXX. Of quadrilateral or four-sided figures, a square has all its sides equal and all its angles right angles....angles right angles, but has not all its sides equal. XXXII. A rhombus has all its sides equal, but its angles are not right angles. XXXIII. A rhomboid has... ## Euclid in Paragraphs: The Elements of Euclid: Containing the First Six Books ...

Euclid - Geometry - 1845 - 218 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. XXXII. A rhombus, is that which has all its sides equal, but its angles are not right angles. XXX1I1.... ## A system of practical mathematics; being no.xvi. of a new series of school-books

Scottish school-book assoc - 1845 - 434 pages
...which has one obtuse angle. 31. An acute angled triangle has all its angles acute. 32. Of four- sided figures, a square is that which has all its sides equal, and all its angles right angles. 33. A rectangle is that which has all its angles right angles, but all its sides are not equal. 34.... ## The First Six, and the Eleventh and Twelfth Books of Euclid's Elements: With ...

Euclid, James Thomson - Geometry - 1845 - 380 pages
...also are two angles which are together equal to two right angles. -, A square is a four-sided figure which has all its sides equal and all its angles right angles. " A rhombns is a four-sided figure which has all its sides equal ; but its angles are not right angles."... ## The Elements of Euclid, the parts read in the University of Cambridge [book ...

Euclides - 1846 - 292 pages
...: xxix. An acute-angled triangle is that which has three acute angles. Of four-sided figures, xxx. A square is that which has all its sides equal, and...is that which has all its angles right angles, but not all its sides equal : xxxn. A rhombus is that which has all its sides equal, but its angles are... 