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Geometry Terms
N/A
58
Mathematics
7th Grade
05/06/2009

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Term
line
Definition
a line that will go on forever in both directions
Term
line segment
Definition
a line that has a point on both ends
Term
ray
Definition
a line that will go on forever in one way
Term
perpendicular line
Definition
lines that meet at 90 degree angle
Term
parallel lines
Definition
two lines the at no matter how far they strech the will never intersect
Term
transversal
Definition
a line that intersects two lines
Term
complementary angles
Definition
two angles that from a 90 degree angle
Term
supplementary angles
Definition
two angles that form a 180 degree angle
Term
vertical angles
Definition
a pair of oppsite angles that is formed by intersecting lines
Term
corrsponding angles
Definition
any pair of angles in a simaler location with respect to the tranversal
Term
alternate exterior angles
Definition
exterior angles on alternate sides of the transversal
Term
alternate interior angles
Definition
interior angles on alternates sides of the transversal
Term
same side interior angles
Definition
interior angles on the same side of the transversal
Term
same side interior angles
Definition
exterior angles on the same side of the transversal
Term
polygon
Definition
a closed plane figure made up of several line segments that are jioned together
Term
vertex
Definition
the point on an angle where two sides intersect
Term
side
Definition
one of the line segments on a polygon
Term
diagonal line
Definition
line segment connecting two non ajacent vertices on a polygon
Term
triangle
Definition
a three sided polygon that its angle measure is 180
Term
pentagon
Definition
a five sided polygon that has an angle measurement of 540
Term
hexagon
Definition
a six sided polygon with and angle measurement of 720
Term
heptagon
Definition
a seven sided polygon with an angle measurement of 900
Term
octagon
Definition
an eight sided polygon with angle measurement of 1080
Term
nonagon
Definition
a nine sided polygon with an angle measurement of 1260
Term
decagon
Definition
a ten sided polygon with an angle measurement of 1440
Term
quadrilateral
Definition
any closed four sided figure that has an angle measurement of 360
Term
parallelogram
Definition
a quadrilateral with two parallel sides
Term
rhombus
Definition
a quadrilateral wit all the sides the same lenth
Term
rectangle
Definition
a quadrilateral with all four angles 90 and two sides longer than the other two
Term
square
Definition
a quadrilateral that all four sides are the same lenth and the angles are all 90
Term
trapezoid
Definition
a quadrilateral with only one pair of parallel sides
Term
perimeter
Definition
the lenth of the all sides on a polygon
Term
circumference
Definition
the measurement of the edge around the circle
Term
area
Definition
the space inside a polygon or circle
Term
surface area
Definition
the area of all the sides on a prism or ect
Term
volume
Definition
basicly the measurement of the area inside a prism or ect
Term
radius
Definition
half of the diameter and also half of the higth of the circle
Term
diameter
Definition
the lenth between one part of the circle and the part of the circle opsite from it
Term
prism
Definition
a 3D object whose base is a polygon
Term
pyramid
Definition
a 3D figure whose bas is a square and sides a triangles
Term
cylinder
Definition
a 3D object whose bases are circles
Term
cone
Definition
a 3D figure that has a circle for its base and then goes up and ends in a point
Term
Base
Definition
the bottom of a plane figure or 3D figure
Term
face
Definition
a flat surface on a 3D figure
Term
edge
Definition
in where to sides come together on a 3D figure
Term
vertex
Definition
the pionts were angles form on a 2D figure
Term
net
Definition
a connected 2D pattern of polygons that folds to form to formla 3D object
Term
congruent figures
Definition
two angles whose measures have a sum of 90 degrees
Term
similar figures
Definition
two figures that have a similarity transformation mapping onto the other
Term
line of symmetry
Definition
a line if that folded on it will match up on both sides
Term
line of symmetry
Definition
a line if that folded on it will match up on both sides
Term
order of rotation
Definition
the order in which you do rotation of a figure
Term
angle of rotation
Definition
how many degrees you have to rotate a figure to get it to match back up with itself
Term
transformation
Definition
a change in the position shape or size of a geometric figure
Term
reflection
Definition
when you make the same figure but up side down on an achordinte plane
Term
rotation
Definition
the transformation that yields a rotational image. also called a turn
Term
dilation
Definition
when you exspand or contract a figure
Term
scale factor
Definition
the measurement that "conects" a smaller version to the actual size
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