Geometry describes many basic shapes that appear in the real world. A point is a zero-dimensional figure represented as a dot or ordered pair of numbers. A line extends infinitely in both directions and connects two points, while a line segment connects two points without extending beyond them. A plane is a two-dimensional surface made up of lines that extends infinitely in all directions. Common shapes include triangles, rectangles, circles, spheres, cylinders, and polygons with various numbers of sides.

1. Geometry in the Real WorldKristen TegzeP2

2. Pointa zero-dimensional figure; while usually left undefined, has four main representations - the dot, the node, the location, and the ordered pair of numbers.

3. Line (Segment)A straight line which links two points without extending beyond them.

4. PlaneA two-dimensional group of points that goes on infinitely in all directions; made up of infinite lines.

5. AngleA shape, formed by two lines or rays diverging from a common point (the vertex).

6. Perpendicular LinesA line is perpendicular to another if it meets or crosses it at right angles (90°).

7. Parallel LinesLines are parallel if they lie in the same plane, and are the same distance apart over their entire length.

8. TriangleA closed figure consisting of three line segments linked end-to-end. A 3-sided polygon.

9. Right TriangleA triangle where one of its interior angles is a right angle (90 degrees).

10. PentagonA number of coplanar line segments, each connected end to end to form a closed shape.

11. HexagonA polygon with 6 sides.

12. SquareA 4-sided regular polygon with all sides equal and all internal angles 90°.

13. RectangleA 4-sided polygon where all interior angles are 90°.

14. TrapezoidA quadrilateral which has at least one pair of parallel sides.

15. ParallelogramA quadrilateral with both pairs of opposite sides parallel and equal in length.

16. CircleA line forming a closed loop, every point on which is a fixed distance from a center point.

17. CylinderA Cylinder is a three-dimensional geometric figure that has two congruent and parallel bases.

18. SphereA three-dimensional surface, all points of which are equidistant from a fixed point.A spherical object or figure.

19. OctagonA polygon with 8 sides.

20. DecagonA polygon with ten sides and ten angles.

21. Nonagon A nine-sided polygon.

22. All Done!!!!