The document provides definitions and properties of basic geometric terms, including points, line segments, planes, angles, and various shapes such as triangles, polygons, and circles. It discusses properties of triangles (like right triangles), different types of polygons (including pentagons, hexagons, and octagons), as well as three-dimensional figures like cylinders and spheres. The document serves as an introductory overview of fundamental concepts in geometry.

1. Geometry in the Real World By Canute Jacobsen Mrs. Sykes 2 nd block

2. Point An undefined term in geometry. It names a location and has no size. *Registration and inspection stickers on a windshield are examples of points on a plane.

3. Line Segment A part of a line consisting of two endpoints and all points between them.

4. Plane A flat surface that has no thickness and extends forever.

5. Angle A figure formed by 2 rays, or sides, with a common endpoint.

6. Perpendicular lines Lines that intersect at 90 degrees.

7. Parallel Lines Coplaner lines that do not intersect.

8. Triangle A 3-sided shape whose angles add up to 180 degrees.

9. Right triangle A triangle with one right angle.

10. Pentagon Car windows are sometimes pentagons. A five sided polygon.

11. Hexagon A six-sided polygon.

12. Square A quadrilateral with four congruent sides and four congruent angles.

13. Rectangle A quadrilateral with four right angles.

14. Trapezoid A quadrilateral with exactly one pair of par allel sides.

15. Parallelogram A quadrilateral with two pairs of parallel sides.

16. Circle The set of points in a pla ne that are a fixed distance from a given point called the center of the circle.

17. Cylinder A three-dimensional figure with two parallel congruent circular bases and a curbed lateral surface that connects the bases.

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

19. Octagon An eight-sided polygon.

20. Oval A closed plane curve resulting from the intersection of a circular cone and a plane cutting completely through it.

21. Skew Lines Lines that are not coplaner.