Geometry Vocabulary

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1. 

 
Rectangular Prism
 
2. 

 
Triangular Prism
 
3. 

 
Rectangular Pyramid
 
4. 

 
Square Pyramid
 
5. 

 
Sphere
 
6. 

 
Cylinder
 
7. 

 
Cone
 
8. 
A flat shape
 
Plane Figure
 
9. 
Three dimensions, length, width, and height
 
Solid Figure
 
10. 
A flat surface on a solid figure
 
Face
 
11. 
3 or more edges meet
 
Vertex
 
12. 
Line segment where 2 faces meet
 
Edge
 
13. 
Pattern that can be used to make a solid
 
Net
 
14. 
A closed plane figure made up of line segments
 
Polygon
 
15. 
3 Sides
 

Triangle

 
16. 
4 Sides
 

Quadrilateral

 
17. 
5 Sides
 

Pentagon

 
18. 
6 Sides
 

 
19. 
8 Sides
 

Octogon

 
20. 
An exact location in space
 
Point
 
21. 
A straight path of points that goes on and on in 2 directions
 
Line
 
22. 
Part of a line. Has two endpoints
 
Line segment
 
23. 
Part of a line. Has 1 endpoint and continues on in 1 direction
 
Ray
 
24. 
Formed by 2 rays that have the same endpoint
 
Angle
 
25. 
Common endpoint in an angle
 
Vertex
 
26. 

A square corner

(90 degrees)

 

Right Angle


 
27. 
Less than a right angle (< 90 degrees)
 

Acute Angle

 
28. 
Greater than a right angle (> 90 degrees)
 

Obtuse Angle

 
29. 

Forms a straight line

(180 degrees)

 

Straight Angle

 
30. 
Lines that never intersect
 

Parallel Lines


 
31. 
Lines that pass through the same point
 

Intersecting Lines


 
32. 
Lines that form right angles
 

Perpendicular Lines


 
33. 
Triangle with all sides the same length
 

Equilateral Triangle


 
34. 
Triangle where at least 2 sides are the same length
 

Isosceles Triangle


 
35. 
No sides of the triangle are the same length
 

Scalene Triangle


 
36. 
One angle of the triangle is 90 degrees
 

Right Triangle

 
37. 
All 3 angles of the triangle is < 90 degrees
 

Acute triangle


 
38. 
One angle of the triangle is > 90 degrees
 

Obtuse Triangle


 
39. 
4 right angles
 

Rectangle


 
40. 
4 right angles and all sides are the same length
 

Square

 
41. 
There is only one pair of parallel sides
 

Trapezoid

 
42. 
Opposite sides are parallel
 

Parallelogram

 
43. 
Opposite sides are parallel and all sides are the same length
 

Rhombus

 
44. 
Closed plane figure with all points the same distance from the point
 

Circle

 
45. 
Point in the middle of the circle
 

Center

 
46. 
Any line segment that connects 2 points on the circle and passes through the center
 

Diameter

 
47. 
Any line segment that connects the center to a point on the circle
 

Radius

 
48. 
Any line segment that connects 2 points on a circle
 

Chord

 
49. 
Moves a figure in a straight direction
 

Slide or translation

 
50. 
Mirror image of a figure
 

Flip or reflection

 
51. 
To move a figure about a point
 

Turn or rotation

 
52. 
Figures that have the same size and shape
 

Congruent

 
53. 
Tile patters that can be drawn by sliding, flipping, or turning shapes
 

Tessellations

 
54. 
A figure that can be folded into 2 congruent halves that fit on top of eachother
 

Symmetric

 
55. 
When folding a symmetric figure you create a ___ __ ______
 

Line of Symmetry

 
56. 
Figures that have the same shape but may or may not have the same size
 

Similar Figures

 
57. 
The distance around a figure
 

Perimeter (L+L+W+W)

 
58. 
The number or square units to cover the region inside a figure
 

Area (L x W)

 
59. 
Sum of the area of all of its faces on a prism
 

Surface Area

 
60. 
Number of cubic units needed to fill a solid figure
 

Volume (L x W x H)