This document defines common geometric terms including point, line, plane, angle, perpendicular lines, parallel lines, triangles, right triangles, pentagons, hexagons, squares, rectangles, trapezoids, parallelograms, circles, cylinders, spheres, pyramids, cubes, and cones. It provides the basic definitions for these terms, stating that points have no size, lines have no thickness, planes extend forever, and polygons have a certain number of sides.

1. Karsten CraveyBlock 5Geometry in the Real World

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

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

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

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

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

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

8. A three-sided polygon.Triangle

9. A triangle with one right angle.Right Triangle

10. A five-sided polygon.Pentagon

11. A six-sided polygon.Hexagon

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

13. A quadrilateral with four right angles.Rectangle

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

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

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

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

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

19. A polyhedron formed by a polygonal and triangular lateral faces that meet at a common vertex.Pyramid

20. A prism with six square faces.Cube

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