This document defines and describes basic geometric shapes including points, lines, planes, angles, triangles, quadrilaterals, circles, cylinders, spheres, cones, and polygons. Points have no size, lines extend forever and have no thickness, planes extend forever and have no thickness. Angles are formed by two rays with a common endpoint. Triangles, pentagons, hexagons, squares, rectangles, trapezoids, parallelograms, rhombuses, and octagons are defined as polygons with a certain number of sides and properties. Circles are sets of points equidistant from the center, cylinders have two circular bases, spheres are sets of points equidistant from the center, and con

1. Andie AlfordBlock: 2Geometry In The Real World

2. PointAn undefined term in geometry, it names a location and has no size.

3. Line (Segment)An undefined term in geometry, a line is a straight path that has no thickness and extends forever.

4. PlaneAn undefined term in geometry, it is a flat surface that has no thickness and extends forever.

5. AngleA figure formed by two rays with a common endpoint.

6. Perpendicular LinesLines that intersect at 90° angles.

7. Parallel LinesLines in the same plane that do not intersect.

8. TriangleA three- sided polygon.

9. Right TriangleA triangle with one right angle.

10. PentagonA five-sided polygon.

11. HexagonA six-sided polygon.

12. SquareA quadrilateral with four congruent sides and four right angles.

13. RectangleA quadrilateral with four right angles.

14. TrapezoidA quadrilateral with exactly one pair of parallel sides.

15. ParallelogramA quadrilateral with two pairs of parallel sides.

16. CircleThe set of points in a plane that are a fixed distance from a given point called the center of the circle.

17. CylinderA three-dimensional figure with two parallel congruent circular bases and a curved lateral surface that connects the bases.

18. SphereThe set of points in a space that are a fixed distance from a given point called the center of the sphere.

19. ConeA three- dimensional figure with a circular base an a curved lateral surface that connects the base to a point called the vertex.

20. RhombusA four-sided shape where all sides have equal length. Also opposite sides are parallel and opposite angles and equal.

21. OctagonA eight-sided polygon.