This document defines and describes various geometric shapes and their properties, including: 1) Points, lines, line segments, rays, planes, and their relationships such as intersecting and parallel lines. 2) Angle types such as acute, obtuse, right, complementary and supplementary. 3) Properties of triangles including isosceles, equilateral, scalene, and sum of interior angles. 4) Quadrilateral types including parallelogram, rectangle, rhombus, trapezoid and their properties. 5) Circle elements such as chord, diameter, radius, sector, circumference and area. 6) Properties of regular polygons.

1. Austins Guide to Geometry Lines Angles Triangles Quadrilateral Circles Other Polygons

2. Point A point is a dot in and angle.

3. Plane A plane is a sector in a space

4. Line A line a a straight line that never ends.

5. Line Segment A line segment is when any line and 2 points can be measured

6. Ray 1 point and a line that goes on forever.

7. Intersecting 2 lines that intersect

8. Perpendicular They intersect at a ninety degree angle

9. Parallel 2 lines that never meet each other.

10. Skew Lines that aren't in the same pane.

11. Acute An angle that is smaller than 90 degrees

12. Obtuse An angle thats more than 90 degrees.

13. Right An angle that is 90 degrees exact.

14. Straight 80 degrees

15. Vertex A dot in any angle

16. Vertices The point were 2 angles meet.

17. Complementary Lines across from each other like a vertical

18. Supplementary An angle that does not meet.

19. Vertical pointing up in a line that forms an angle of 90° with a flat surface

20. Opposite Vertical A B

21. Adjacent 2 angles that share a line

22. Right One angle that is 90 degrees

23. Obtuse One of that angles is more than 90 degrees

24. Acute One angle has to be 90 degrees

25. Scalene A triangle with no equal sides

26. Isosceles A triangle with 2 equal sides

27. Equilateral A triangle that has equal sides

28. Sum of internal angles The sum of all angles adding up to 180 degrees

29. Perimeter The perimeter is the addition of all the outside sides together

30. Area of a triangle The area is the length x width, squared

31. Quadrilateral A shape with 4 connected sides

32. Trapezoid A quadrilateral with 2 parallel sides

33. Parallelogram A shape with all opposite sides being parallel

34. Rectangle A quadrilateral with four 90 degree angles

35. Rhombus A square with no right angles

36. Square A figure with 4 right angles

37. Area of a rectangle You have to multiply length x width

38. Area of a square Same thing length x width

39. Area of a parallelogram Do base x height

40. Area of a trapezoid The average of two lengths x height

41. Perimeter of a rectangle You have to add up the angles

42. Perimeter of a square To get perimeter you add up all the angles

43. Chord Segment connecting 2 points

44. Diameter A line segment that passes through the center of a circle

45. Radius A line segment with one end point

47. Circumference The distance around the circle

48. Area of a circle The space inside

49. Hexagon A shape with 6 sides

50. Octagon A shape that has 8 sides

51. Regular polygon All sides are congruent

52. Perimeter of a square To get perimeter you add up all the angles