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Geometry Vocabulary
Burtt's Geometry
23
Mathematics
3rd Grade
04/04/2011

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Cards

Term
line
Definition
a straight path that goes on forever in both directions
Term
line segment
Definition
part of a line that has two endpoints
Term
ray
Definition
part of a line having only one endpoint
Term
angle
Definition
two rays having the same endpoint
Term
point
Definition
an exact position or location
Term
endpoint
Definition
a point at the end of a ray
Term
vertex
Definition
the point that two rays of an angle have in common, the corner where 3 or more edges of a solid figure meet
Term
parallel lines
Definition
lines that never cross even if they are extended
Term
intersecting lines
Definition
lines that cross each other at a point
Term
perpendicular lines
Definition
lines that form square corners where they cross
Term
right angle
Definition
an angle that forms a square corner
Term
acute angle
Definition
an angle that is smaller than a right angle
Term
obtuse angle
Definition
an angle that is larger than a right angle
Term
closed figure
Definition
a figure that begins and ends at the same point
Term
open figure
Definition
a figure that has ends that do not meet
Term
polygon
Definition
a closed figure with straight sides that are line segments
Term
triangle
Definition
a polygon with three sides and three angles
Term
quadrilateral
Definition
a polygon with four sides and four angles
Term
pentagon
Definition
a polygon with five sides and five angles
Term
hexagon
Definition
a polygon with six sides and six angles
Term
octagon
Definition
a polygon with eight sides and eight angles
Term
face
Definition
a flat surface of a solid figure
Term
edge
Definition
the line segment formed where two faces of a solid figure meet
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