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" A Plane Figure is a portion of a plane surface bounded by straight or curved lines. "
Wentworth & Hill's Exercise Manuals: Arithmetic - Page 220
by George Albert Wentworth - 1903
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The Complete Arithmetic, Oral and Written: Second Part

Daniel W. Fish - Arithmetic - 1874 - 302 pages
...angle. 865. An Acute Angle is less than • right angle. Horizontal. TRIANGLES. PLANE FIGURES. 866. A Plane Figure is a portion of a plane surface bounded by straight or curved lines. 8C7. A Polygon is a plane figure bounded by straight lines. 868. The Perimeter...
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The Complete Arithmetic, Part 2

Daniel W. Fish - Arithmetic - 1874 - 298 pages
...right angle. All angles except right angles are called oblique anglet. Horizontal. PLANE FIGURES. 866. A Plane Figure is a portion of a plane surface bounded by straight or curved lines. 867. A Polygon is a plane figure bounded by straight lines. 868. The Perimeter...
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Ray's New Practical Arithmetic: A Rev. Ed. of the Practical Arithmetic

Joseph Ray - Arithmetic - 1877 - 350 pages
...or curved. Thus, the surface of a table or floor is plane; that of a ball or pflobe is curved. 11. A plane figure is a portion of a plane surface bounded by one or more lines. 12. A polygon is a plane figure bounded by straight lines. REM. — Tbe straight...
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Course in Arithmetic: A Treatise in Three Parts, Complete in One Volume

Frederic William Bardwell - Arithmetic - 1878 - 416 pages
...since they can neither converge nor diverge, and it may be shown that they must both be in one plane. A plane figure is a portion of a plane surface bounded by straight or curved lines. A polygon is a plane figure bounded by straight lines. Polygons may have...
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The Progressive Higher Arithmetic: For Schools, Academies, and Mercantile ...

Horatio Nelson Robinson - Arithmetic - 1875 - 472 pages
...each other. 711. An Obtuse Angle is greater than a right angle. ""X MENSURATION. PLANE FIGURES. 7 1 3. A Plane Figure is a portion of a plane surface bounded by straight or curved lines. 714. A Polygon is a plane figure bounded by straight lines. 715. The Perimeter...
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Fish's Arithmetic Number One[-two]: Oral and Written ..., Volume 2

Daniel W. Fish - Arithmetic - 1883 - 348 pages
...form the two right angles ACD and DCB. 211. A surface has two dimensions, length and breadth. 212. A plane figure is a portion of a plane surface bounded by straight or curved lines. 213. A rectangle is a plane figure bounded by four straight lines, having...
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Exercises in Arithmetic

George Albert Wentworth, George Anthony Hill - Arithmetic - 1887 - 448 pages
...which straight lines can be drawn in all directions. The surface of still water is a good example of a plane surface. A Plane Figure is a portion of a plane...figure bounded by four straight lines. For example, A BCD is a quadrilateral ; AB, BC, CD, DA are its tides ; the points A, B, C, D are its vertices ;...
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An Arithmetic for Preparatory Schools, High Schools, and Academies

Charles Austin Hobbs - Arithmetic - 1889 - 366 pages
...right angle is called an obtuse angle, and an angle less than a right angle is called an acute angle. A plane figure is a portion of a plane surface bounded by straight or curved lines. A polygon is a plane figure bounded by straight lines ; the lines are called...
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Arithmetic

George Albert Wentworth - Algebra - 1892 - 312 pages
...be drawn ia all directions. The surface of still water is a good example of a plane surface. A P1ane Figure is a portion of a plane surface bounded by...another plane figure assumed as the unit. For the unite of area, see page 79. The unit most commonly used is the square foot. A Quadrilateral is a plane...
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Robinson's New Practical Arithmetic for Common Schools and Academies

Horatio Nelson Robinson - Arithmetic - 1892 - 428 pages
...than a right angle. An acute angle may be any number of degrees less than 90°. PLANE FIGURES. 492. A Plane Figure is a portion of a plane surface bounded by straight or curved lines. 493. A Polygon is a plane figure bounded by straight Hues. 494. The Perimeter...
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