geometry unit vocabulary/word wall
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Pointa location in space
. .A B.C
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Line segmenta straight path joining
two points
ABendpoint
endpoint
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Raya straight path
with a starting point thatkeeps going in one
direction
A Bendpoint
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Linea straight path that keeps going in both
directions
AB
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ParallelLines, rays, segments
that never meet
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Intersecting
point of intersection
Lines, rays, segmentsthat meet
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Perpendicular
right angle
Lines, rays, segmentsthat meet at right
angles
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Angleformed by 2 rays or
segments that have the same endpoint
vertex
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Right anglean angle that is 90º
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Acute anglean angle that is less than
90º
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Obtuse anglean angle that is
between 90º and 180º
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Straight anglean angle that is 180º
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Reflex anglean angle that is
between 180º and 360º
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Trianglea polygon with 3 sides
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Scalene Trianglea triangle with all sides
of different lengths
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Isoceles Trianglea triangle
with two sides of same length
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Equilateral Trianglea triangle
with all sides of equal length
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Right Trianglea triangle
with one right angle
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Obtuse Trianglea triangle
with one obtuse angle
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Acute Trianglea triangle
with all acute angles
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Quadrilaterala polygon
with 4 sides
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Trapezoida quadrilateral
with 1 pair of parallel sides
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Parallelograma quadrilateral
with 2 pairs of parallel sides
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Rhombusa quadrilateral
with all sides equal length
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Rectanglea parallelogram
with 4 right angles
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Squarea rectangle
with all sides equal
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Kitea quadrilateral with 2
pairs of adjacent equal sides
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Pentagona polygon with 5 sides
Regular pentagon Irregular pentagon
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Hexagon
Regular hexagon Irregular hexagon
a polygon with 6 sides
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Heptagona polygon with 7 sides
Regular heptagon Irregular heptagon
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Octagona polygon with 8 sides
Regular octagon Irregular octagon
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Nonagona polygon with 9 sides
Regular nonagon Irregular nonagon
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Decagona polygon with 10 sides
Regular decagon Irregular decagon
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Undecagona polygon with 11 sides
Regular hendecagon
Irregular hendecagon
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Dodecagona polygon with 12 sides
Regular dodecagon
Irregular dodecagon
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Circlea curved line that forms a
closed path on a flat surface
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Polygona closed, 2-dimensional figure made up of line
segments joined end to end
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Congruentexactly the same shape
and sizeA
B
CD
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Symmetricalhaving the same size and
shape on either side of a line
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Regular Polygona polygon
with all sides of equal length
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Irregular Polygona polygon
with sides of different lengths
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Convex Polygona polygon with all
vertices pushed outward
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Concave Polygona polygon with at least
one vertex pushed in
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Polyhedrona closed 3-dimensional figure whose surfaces
are made up of polygons
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Spherea 3D shape
with a single curved surface
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Conea 3D shape
with a circular base,a curved surface, and one
vertex
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Cylindera 3D shape
with 2 congruent circular bases
connected by a curved surface
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Cubea polyhedron
with 6 square faces
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Pyramida polyhedron
that has a base and triangular faces meeting at
a point (vertex)
Triangular pyramid
Square pyramid
Rectangular pyramid
Pentagonal pyramid
Hexagonal pyramid
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Prism
Triangular prism
Squareprism
Rectangular prism
Pentagonal prism
Hexagonal prism
a polyhedronthat has two identical bases and all flat sides