The document defines and describes various basic geometric shapes and terms including points, lines, planes, angles, triangles, quadrilaterals, circles, spheres, cubes and other three-dimensional shapes. It provides definitions for common two-dimensional shapes such as squares, rectangles, trapezoids and parallelograms. It also defines three-dimensional shapes like cylinders, cones, pyramids and their geometric properties.

1. Geometry in the Real worldMadison DavisBlk 2

2. PointSomething that has position, but not extension, such as the converging point of two lines.

3. Line (Segment)A straight figure that has a defined ends. Unlike a line which extends forever.

4. PlaneA flat, level surface. A surface generated by a straight line moving at constant velocity with respect to a fixed point.

5. AngleThe space within two lines(or line segments) or three or more planes diverging from a common point.

6. Perpendicular LinesLine or line segments that intersect each other at a 90 degree angle.

7. Parallel LinesLine or line segment that never intersect, ever.

8. TriangleA closed plane figure with three sides and three angles which always add up to 180 degrees.

9. Right TriangleA closed plane figure with three sides and three angles, however one of the angles must always be 90 degrees.

10. PentagonA closed plane polygon with 5 sides and 5 angles which add to 540 degrees.

11. HexagonA closed plane figure with 6 sides and 6 angles which add to 720 degrees.

12. SquareA closed place figure with 4 equal sides and 4 90 degree angles.

13. RectangleA closed plane figure with 4 sides and 4 90 degree angles.

14. TrapezoidA quadrilateral figure with two parallel lines and two non parallel lines.

15. ParallelogramA quadrilateral figure having both pairs of opposite sides parallel to each other.

16. CircleA closed plane curve consisting of all given points at a distance from the center. Equation: x^2 + y^2 = r^2

17. CylinderA surface or solid bounded by two parallel planes and generated by a straight line moving parallel to the given planes and tracing a curve bounded by the planes and lying in a plane perpendicular or oblique to the given planes.

18. SphereA solid figure generated by the revolution of a semicircle about it’s diameter.

19. CubeA solid bounded by six equal squares, the angle between any two adjacent faces being right.

20. ConeA solid whose surface is generated by a line passing through a fixed point and a fixed plane curve not containing the point, consisting of two equal sections joined at a vertex.

21. PyramidA solid having a polygonal base and triangular sides which meet at one point.