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Geometry Unit Vocabulary/Word Wall

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Geometry Unit Vocabulary/Word Wall

1. 1. Point a location in space . .A B .C
2. 2. Line segment a straight path joining two points A Bendpoint endpoint
3. 3. Ray a straight path with a starting point that keeps going in one direction A B endpoint
4. 4. Line a straight path that keeps going in both directions A B
5. 5. Parallel Lines, rays, segments that never meet
6. 6. Intersecting point of intersection Lines, rays, segments that meet
7. 7. Perpendicular right angle Lines, rays, segments that meet at right angles
8. 8. Angle formed by 2 rays or segments that have the same endpoint vertex
9. 9. Right angle an angle that is 90º
10. 10. Acute angle an angle that is less than 90º
11. 11. Obtuse angle an angle that is between 90º and 180º
12. 12. Straight angle an angle that is 180º
13. 13. Reflex angle an angle that is between 180º and 360º
14. 14. Triangle a polygon with 3 sides
15. 15. Scalene Triangle a triangle with all sides of different lengths
16. 16. Isoceles Triangle a triangle with two sides of same length
17. 17. Equilateral Triangle a triangle with all sides of equal length
18. 18. Right Triangle a triangle with one right angle
19. 19. Obtuse Triangle a triangle with one obtuse angle
20. 20. Acute Triangle a triangle with all acute angles
21. 21. Quadrilateral a polygon with 4 sides
22. 22. Trapezoid a quadrilateral with 1 pair of parallel sides
23. 23. Parallelogram a quadrilateral with 2 pairs of parallel sides
24. 24. Rhombus a quadrilateral with all sides equal length
25. 25. Rectangle a parallelogram with 4 right angles
26. 26. Square a rectangle with all sides equal
27. 27. Kite a quadrilateral with 2 pairs of adjacent equal sides
28. 28. Pentagon a polygon with 5 sides Regular pentagon Irregular pentagon
29. 29. Hexagon Regular hexagon Irregular hexagon a polygon with 6 sides
30. 30. Heptagon a polygon with 7 sides Regular heptagon Irregular heptagon
31. 31. Octagon a polygon with 8 sides Regular octagon Irregular octagon
32. 32. Nonagon a polygon with 9 sides Regular nonagon Irregular nonagon
33. 33. Decagon a polygon with 10 sides Regular decagon Irregular decagon
34. 34. Undecagon a polygon with 11 sides Regular hendecagon Irregular hendecagon
35. 35. Dodecagon a polygon with 12 sides Regular dodecagon Irregular dodecagon
36. 36. Circle a curved line that forms a closed path on a flat surface
37. 37. Polygon a closed, 2-dimensional figure made up of line segments joined end to end
38. 38. Congruent exactly the same shape and size A B C D
39. 39. Symmetrical having the same size and shape on either side of a line
40. 40. Regular Polygon a polygon with all sides of equal length
41. 41. Irregular Polygon a polygon with sides of different lengths
42. 42. Convex Polygon a polygon with all vertices pushed outward
43. 43. Concave Polygon a polygon with at least one vertex pushed in
44. 44. Polyhedron a closed 3-dimensional figure whose surfaces are made up of polygons
45. 45. Sphere a 3D shape with a single curved surface
46. 46. Cone a 3D shape with a circular base, a curved surface, and one vertex
47. 47. Cylinder a 3D shape with 2 congruent circular bases connected by a curved surface
48. 48. Cube a polyhedron with 6 square faces
49. 49. Pyramid a polyhedron that has a base and triangular faces meeting at a point (vertex) Triangular pyramid Square pyramid Rectangular pyramid Pentagonal pyramid Hexagonal pyramid
50. 50. Prism Triangular prism Square prism Rectangular prism Pentagonal prism Hexagonal prism a polyhedron that has two identical bases and all flat sides