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" Two lines are said to be parallel, when being situated in the same plane, they cannot meet, how far soever, either way, both of them be produced. 13. A plane figure is a plane terminated on all sides by lines, either straight or curved. If the lines are... "
Elements of Surveying, and Navigation: With a Description of the Instruments ... - Page 19
by Charles Davies - 1835 - 359 pages
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Elements of Geometry and Trigonometry: With Notes

Adrien Marie Legendre - Geometry - 1822 - 394 pages
...polygon, and the lines themselves taken together form the contour or perimeter of the polygon. XIV. The polygon of three sides, the simplest of all, is called a triangle ; that of four sides, a quadilateral ; that of five, a pentagon ; that of six, a hexagon ; and so on. XVI. A right-angled triangle...
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Elements of Geometry and Trigonometry: With Notes

Adrien Marie Legendre - Geometry - 1828 - 346 pages
...13. A plane figure is a plane terminated on all sides by lines. If the lines are straight, the spare they enclose is called a rectilineal figure, or polygon,...that of five, a pentagon ; that of six, a hexagon ; and so on. 15. An equilateral triangle is one which has its three sides equal ; an isosceles triangle,...
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Elements of Geometry and Trigonometry: With Notes

Adrien Marie Legendre - Geometry - 1830 - 344 pages
...either way, both of them __ be produced. 13. A plane figure is a plain terminated on all sides by lines. If the lines are straight, the space they enclose...that of five, a pentagon ; that of six, a hexagon ; and so on. 15. An equilateral triangle is one which has its three sides equal ; an isosceles triangle,...
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Elements of Geometry: Containing the First Six Books of Euclid, with a ...

John Playfair - Euclid's Elements - 1835 - 336 pages
...polygon, and the lines themselves taken together form the contour, or perimeter of the polygon. 17. The polygon of three sides, the simplest of all, is...that of five, a pentagon ; that of six, a hexagon ; and so on. 18. Of three sided figures, an equilateral triangle is that which has three equal sides....
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Elements of Geometry and Trigonometry

Adrien Marie Legendre - Geometry - 1836 - 394 pages
...angle BAC, less than aD\ right angle, is an acute angle ; and \ every angle DEF, greater than aright \ angle, is an obtuse angle. 12.- Two lines are said...; that of nine, a nonagon; that of ten, a decagon ; and that of twelve, a dodecagon. B 15. An equilateral triangle is one which has its three sides equal...
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Elements of Geometry and Trigonometry

Adrien Marie Legendre - Geometry - 1837 - 376 pages
...right angle ; and the line AB is said to be perpendicular to CD. ; D 11. Every angle BAC, less than aD\ right angle, is an acute angle ; and every angle DEF,...; that of nine, a nonagon; that of ten, a decagon ; and that of twelve, a dodecagon. 15. An equilateral triangle is one which has its three sides equal...
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Elements of Geometry and Trigonometry

Adrien Marie Legendre - Geometry - 1838 - 382 pages
...situated in the same plane, they cannot meet, how far soever, either way, both of them ~ be produced. J3. A plane figure is a plane terminated on all sides...; that of nine, a nonagon; that of ten, a decagon ; and that of twelve, a dodecagon. BOOK I. 11 15. An equilateral triangle is one which has its three...
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Elements of Surveying: With a Description of the Instruments and the ...

Charles Davies - Surveying - 1839 - 376 pages
...-I1 10 When a straight line AB meets another straight line CD, so as to make the adjacent angles BAG, BAD, equal to each other, each of these angles is...An equilateral triangle is one which has its three sidea equal ; an isosceles triangle, one which has two of its sides equal ; a scalene triangle, one...
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Elements of Surveying: With a Description of the Instruments and the ...

Charles Davies - Surveying - 1839 - 376 pages
...two angles DCB, BCE ; and the angle DCB is the difference of the A two angles DCE, BCE. DEFINITIONS. 10. When a straight line AB meets another straight...triangle; that of four sides, a quadrilateral; that of live, & pentagon; that of six, a hexagon ; that of seven, a heptagon; that of eight, an octagon; that...
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Elements of Geometry and Trigonometry

Adrien Marie Legendre - Geometry - 1839 - 372 pages
...polygon, and the lines themselves, taken together, form the contour, or perimeter of the polygon, t 14. The polygon of three sides, the simplest of all,...; that of nine, a nonagon; that of ten, a decagon ; and that of twelve, a dodecagon. 15. An equilateral triangle is one which has its three sides equal...
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