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Geometry Terms (Chapter 15)
Geometry termms
34
Mathematics
3rd Grade
01/22/2008

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Term
line
Definition
a straight path without end in two directions
Term
line segment
Definition
part of a line with two endpoints
Term
ray
Definition
part of a line. It has one endpoint. It also goes on without end in one direction.
Term
angle
Definition
formed by two rays with the same endpoint.
Term
right angle
Definition
an angle that has a square corner. It measures 90 degrees.
Term
acute angle
Definition
less than a right angle
Term
obtuse angle
Definition
more than a right angle
Term
parallel lines
Definition
lines that are the same distance apar
Term
intersecting lines
Definition
lines that cross at a common point
Term
perpendicular lines
Definition
lines that cross at a right angle
Term
plane figure
Definition
flat figures. They can be closed or not closed
Term
polygon
Definition
are closed figures that have three or more line segments
Term
side
Definition
each line in a polygon
Term
vertex
Definition
point where to sides meet
Term
triangle
Definition
3 sides
Term
square
Definition
"4 sides, 4 equal sides, 4 right angles, opposite sides parallel"
Term
rectangle
Definition
"4 sides, 4 right angles, opposite sides parallel"
Term
pentagon
Definition
5 sides
Term
hexagons
Definition
6 sides
Term
octagons
Definition
8 sides
Term
regular polygon
Definition
have all sides and angles the same
Term
irregular polygon
Definition
sides and angles can be different sizes.
Term
quadrilateral
Definition
"4 sides, 4 angles"
Term
Paralleogram
Definition
"4 sides, 4 angles, opposite sides are parallel"
Term
diagonal
Definition
connects two vertices of a polygon that are not next to each other
Term
equalateral triangle
Definition
all of the sides have equal lengths
Term
isosceles triangle
Definition
two sides have equal lengths
Term
right triangle
Definition
one angle is a right angle
Term
scalene triangle
Definition
each side is a different length
Term
solid figures
Definition
"3 dimensional, not flat like plane figures"
Term
complex solid figure
Definition
made up of more than one or two solid shapes
Term
vertex (solid figures)
Definition
a point where edges meet.
Term
face
Definition
a flat surface of a solid figure
Term
edge
Definition
is formed when two faces meet
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