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Geometry Unit Vocabulary/Word Wall
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Geometry Unit Vocabulary/Word Wall

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