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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