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

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

Euclid - Geometry - 1892 - 460 pages
...rectangle is a parallelogram which has one of its angles a right angle. 28. A square is a four.sided figure which has all its sides equal and all its angles right angles. [It may easily be shewn that if a quadrilateral lias all its sides equal and one angle a right angle,...

## Elementary Practical Mathematics

Frank Castle - Mathematics - 1899 - 424 pages
...A rectangle is a parallelogram having each of its angles a right angle A square is a parallelogram which has all its sides equal and all its angles right angles. A rhombus is a parallelogram having all its sides equal, but its angles are not right angles. A trapezium...

## Workshop Mathematics, Part 1

Frank Castle - Mathematics - 1900 - 184 pages
...the opposite side, but is also perpendicular to the two adjacent sides. A square is a parallelogram which has all its sides equal, and all its angles right angles. A rhombus is a parallelogram having all its sides equal, but its angles are not right angles. A trapezium...

## A Text-book of Euclid's Elements for the Use of Schools. Books I and II, Book 1

Henry Sinclair Hall, Frederick Haller Stevens - Euclid's Elements - 1900 - 330 pages
...triangle must have at least two acute, anyles. ] QUADRILATERALS. 30. A square is a four.sided figure which has all its sides equal and all its angles right angles. [It may be shewn that if a quadrilateral has all its sides equal and one angle a right angle, then...

## Euclid, His Life and System

Thomas Smith (D.D.) - Euclid's Elements - 1902 - 244 pages
...truth; and that he might just as well have defined an equilateral triangle as a three-sided figure which has all its sides equal and all its angles right angles. It happens, indeed, that the square as defined does exist, and the triangle as so defined does not...

## A Text-book of Euclid's Elements for the Use of Schools, Book 1

Euclid - Euclid's Elements - 1904 - 488 pages
...is a triangle which has three acute angles. QUAD RILATE RA IS. 30. A square is a four-sided figure which has all its sides equal and all its angles right angles. [It may be shewn that if a quadrilateral has all its sides equal and one angle a right angle, then...

## Modern Sheet-metal Workers' Instructor: Practical Geometry, Mensuration ...

Joseph H. Rose - Sheet-metal work - 1906 - 340 pages
...hypothenuse in a right-angled triangle is the side opposite the right angle as in Fig. 7. Fig. 7. Fig. 8. A square is that which has all its sides equal and all its angles right-angled as in Fig. 8. A rectangle is that which has all its angles right angles, but only its...

## Practical Mechanical Drawing and Machine Design, Self Taught ...

Charles Westinghouse - Machine design - 1906 - 168 pages
...40. The hypothenuse in a right angled triangle is the side opposite the right angle as in Fig. 40. A square is that which has all its sides equal and all its angles right-angled as in Fig. 41. A rectangle is that which has all its angles Fig. 41. Fig. 42. right angles,...