1. Geometry
The strand of math that deals with measurement and comparing figures, both plane and solid .

2. Open Figure
Closed Figure

3. Attributes
A quality that is characteristic of someone or something.

4. Congruent
– figures that have exactly the same size and same shape

5. Side
– any of the line segments that
form a polygon
Side

6. Plane
– A flat surface that goes on
forever in all directions

7. Plane Figure
– Any two-dimensional
figure

8. Lines parallel lines Lines in a plane that never intersect Example:
perpendicular lines
Two lines that intersect to form four right angles Example:

9. Ray
A part of a line, with one endpoint, that continues without end in one direction Example:
ray CD

10. Angles angle A figure formed by two rays that have a common endpoint
Acute angle
An angle that has a measure less than a right angle (less than 90°) Example:
obtuse angle
An angle whose measure is greater than 90° and less than 180° Example:                                                          

11. Polygon
– a closed plane figure with
straight sides

12. Quadrilateral
– a four sided polygon

13. Square – A plane figure with four sides that are the same length
and four right angles

14. Rectangle
– a plane figure with four
sides and four right angles

15. Triangle
– A plane figure with three
straight sides

16. Pentagon
– a five-sided polygon

17. Trapezoid – a quadrilateral with only
one pair of parallel sides

18. Rhombus – a parallelogram whose four sides are congruent and
opposite angles are
congruent

19. Hexagon
– a six sided polygon 1 6 2 5 3 4

20. Octagon – An eight-sided polygon
STOP

21. Parallelogram – any four sided polygon with two pairs
of parallel lines

22. – A figure with
3 dimensions; not flat
Solid figure

23. – having length,
width, height,
and volume
Three Dimensional

24. Three-Dimensional Figures

25. Horizontal Horizontal – the direction from left to right V E R T I C A
Vertical
– The direction from top to bottom

26. – A place where two or more sides meet on a geometric solid
Edge
– A place where two or more sides meet on a geometric solid
Edge

27. Face
– A flat side on a geometric solid
Face

28. Vertex – a corner; a place where three or more sides meet in
a geometric solid

29. Vertices
– more than one corner
Vertex

30. Cube – A solid figure with six congruent square faces

31. Prism – A 3-dimensional figure that has two congruent and parallel
faces that are polygons.
The rest of the faces are
parallelograms
Hexagonal prism
rectangular prism

32. Rectangular Prism – A solid figure in which all six faces are
rectangles

33. Pyramid – a polyhedron whose base is a polygon whose other faces
are triangles that share a
common vertex

34. Square Pyramid square pyramid
A pyramid with a square base and four triangular faces Example:

35. Sphere – any round object whose curved surface is the same
distance to the center as all
of its points

36. –
Cylinder
A solid figure with two circular bases that are parallel and congruent

37. Cone
– a solid figure with one curved surface, one circular base, and one vertex
Vertex
Circular Base

38. Base – A special face of a solid figure
The base of a cone is a circle.