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# Glossary of Geometry

1. acute angle  An abstract concept of a geometric feature that is the angle formed by two lines is smaller than a right angle and is less than 90 degree.last updated 16 Apr 2015
http://en.wikipedia.org/wiki/Angle#Types_of_angleslast updated 16 Apr 2015
2. apex  An abstract concept of a zero dimensional geometric feature that is the highest point or top of something when considering in upright position.last updated 16 Apr 2015
http://en.wikipedia.org/wiki/Apex_%28geometry%29last updated 16 Apr 2015
3. base  An abstract concept of a geometric feature that is the lowest part, foot or bottom of something when considering in upright position.last updated 16 Apr 2015
http://en.wikipedia.org/wiki/Base_%28geometry%29last updated 16 Apr 2015
4. circle  An abstract concept of a two dimensional geometric figure that is a plane shape bounded by one single line with all straight lines radiating from only one single point within the figure and falling upon the line are of equal in length.last updated 16 Apr 2015
http://en.wikipedia.org/wiki/Circlelast updated 16 Apr 2015
5. circumference  An abstract concept of a geometric feature that is the border line around the enclosing boundary of a curved geometric figure.last updated 16 Apr 2015
http://en.wikipedia.org/wiki/Circumferencelast updated 16 Apr 2015
6. cone  An abstract concept of a three dimensional geometric figure that is the geometric form of an solid object bounded by two surface boundaries or sides obtained by turning a right triangle a full 360 degree rotation with one side adjacent to the right angle fixed as the rotating axis in three dmensional space.last updated 17 Apr 2015
http://en.wikipedia.org/wiki/Conelast updated 17 Apr 2015
7. cube  An abstract concept of a three dimensional geometric figure that is the geometric form of an solid object bounded by six square surface boundaries or sides of the same size in three dmensional space with angle between two adjacent sides is a right angle.last updated 16 Apr 2015
http://en.wikipedia.org/wiki/Cubelast updated 16 Apr 2015
8. diagonal  An abstract concept of a one dimensional geometric thing that is the linear connection of two non-consecutive vertices in an object through a straight line segment.last updated 16 Apr 2015
http://en.wikipedia.org/wiki/Diagonallast updated 16 Apr 2015
9. diameter  An abstract concept of a one dimension geometric feature that is the straight line radiated in both directions from a point within the boundary through the center to the boundary.last updated 16 Apr 2015
http://en.wikipedia.org/wiki/Diameterlast updated 16 Apr 2015
10. ellipse  An abstract concept of a two dimensional geometric figure that is a plane shape bounded by one single line with the sum of distances from two fixed points within the figure radiating to every point on the boundary is a constant.last updated 16 Apr 2015
http://en.wikipedia.org/wiki/Ellipselast updated 16 Apr 2015
11. geometric shape  An abstract concept of a geometric figure that is the geometric form of an object, usually a plane shape or figure, bounded by any boundary or boundaries.last updated 16 Apr 2015
http://en.wikipedia.org/wiki/Shapelast updated 16 Apr 2015
12. hypotenuse  An abstract concept of a geometric feature that is the longest side of a right angle triangle opposite to the right angle.last updated 16 Apr 2015
http://en.wikipedia.org/wiki/Hypotenuselast updated 16 Apr 2015
13. isosceles triangle  An abstract concept of a two dimensional geometric figure that is a plane shape with three straight sides of only two adjacent sides equal in length.last updated 16 Apr 2015
http://en.wikipedia.org/wiki/Isosceles_trianglelast updated 16 Apr 2015
14. line  An abstract concept of a general one dimensional geometric thing that is a straight or curved continuous extent of length with no breadth and thickness.last updated 15 Apr 2015
http://en.wikipedia.org/wiki/Line_%28geometry%29last updated 15 Apr 2015
15. parallel lines  An abstract concept of a two dimensional geometric feature that is two lines lying in a plane do not meet one another in neither directions when indefinitely in both direction.last updated 15 Apr 2015
http://en.wikipedia.org/wiki/Parallel_%28geometry%29last updated 15 Apr 2015
16. perpendicular lines  An abstract concept of a two dimensional geometric feature that is two lines standing upon one another in a plane with all formed adjacent angles equal to a right angle.last updated 15 Apr 2015
http://en.wikipedia.org/wiki/Perpendicularlast updated 15 Apr 2015
17. pyramid  An abstract concept of a three dimensional geometric figure that is the geometric form of an solid object bounded by surface boundaries or sides obtained by connecting a polygonal base flat plane to a point of apex by lateral flat faces in three dmensional space.last updated 17 Apr 2015
http://en.wikipedia.org/wiki/Pyramid_%28geometry%29last updated 17 Apr 2015
18. radius  An abstract concept of a one dimension geometric feature that is the straight line radiated from the center to every point on the boundary.last updated 16 Apr 2015
19. rectangle  An abstract concept of a two dimensional geometric figure that is a plane shape with four straight sides of opposite sides equal in length forming four internal right angles to each other.last updated 16 Apr 2015
http://en.wikipedia.org/wiki/Rectanglelast updated 16 Apr 2015
20. right angle  An abstract concept of a geometric feature that is the angle formed by two lines standing upon one another in a plane when all formed adjacent angles equal to one another and is equal to 90 degree.last updated 16 Apr 2015
http://en.wikipedia.org/wiki/Right_anglelast updated 16 Apr 2015
21. right triangle  An abstract concept of a two dimensional geometric figure that is a plane shape with three straight sides of two adjacent sides forming a right angle to each other.last updated 16 Apr 2015
http://en.wikipedia.org/wiki/Right_trianglelast updated 16 Apr 2015
22. side  An abstract concept of a border of the boundary of something that is the edge or extremity of something.last updated 15 Apr 2015
http://en.wikipedia.org/wiki/Edge_%28geometry%29last updated 15 Apr 2015
23. solid figure  An abstract concept of a three dimensional geometric figure that is the geometric form of an object bounded by any boundary or boundaries in three dmensional space.last updated 16 Apr 2015
http://en.wikipedia.org/wiki/Solid_geometrylast updated 16 Apr 2015
24. sphere  An abstract concept of a three dimensional geometric figure that is the geometric form of an solid object bounded by one surface boundaries or sides obtained by turning a semicircle a full 360 degree rotation with the diameter as the rotating axis in three dmensional space.last updated 17 Apr 2015
http://en.wikipedia.org/wiki/Spherelast updated 17 Apr 2015
25. square  An abstract concept of a two dimensional geometric figure that is a plane shape with four straight sides of equal length forming four internal right angles to each other.last updated 15 Apr 2015
http://en.wikipedia.org/wiki/Squarelast updated 15 Apr 2015
26. straight line  An abstract concept of a one dimensional geometric thing that is a straight continuous extent of length with no breadth and thickness.last updated 15 Apr 2015
http://en.wikipedia.org/wiki/Line_%28geometry%29last updated 15 Apr 2015

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