This document defines and describes basic geometric shapes and terms including points, lines, planes, angles, triangles, quadrilaterals, circles, cylinders, spheres, and other polygons. Key geometric concepts covered are lines, planes, angles, perpendicular and parallel lines, triangles, squares, rectangles, trapezoids, parallelograms, circles, cylinders, spheres, octagons, cubes, and hemispheres.

1. Geometry in the Real World By Sam Spoonemore Block 1

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

3. Line (Segment) A part of a line that is bounded by two end points, and contains every point on the line between its end points.

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 space that are a fixed distance from a given point called the center of the sphere.

19. Octagon An eight-sided polygon.

20. Cube A prism with six square faces.

21. Hemisphere Half of a sphere.