1. Andie Alford Block: 2 Geometry In The Real World

2. Point An 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. Plane An undefined term in geometry, it is a flat surface that has no thickness and extends forever.

5. Angle A figure formed by two rays with a common endpoint.

6. Perpendicular Lines Lines that intersect at 90° angles.

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

8. Triangle A three- sided polygon.

9. Right Triangle A triangle with one right angle.

10. Pentagon A five-sided polygon.

11. Hexagon A six-sided polygon.

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

13. Rectangle A quadrilateral with four right angles.

14. Trapezoid A quadrilateral with exactly one pair of parallel sides.

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

16. Circle The set of points in a plane 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 curved lateral surface that connects the bases.

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

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

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

21. Octagon A eight-sided polygon.