Pointa location in space

. .A B.C

Line segmenta straight path joining

two points

ABendpoint

endpoint

Raya straight path

with a starting point thatkeeps going in one

direction

A Bendpoint

Linea straight path that keeps going in both

directions

AB

ParallelLines, rays, segments

that never meet

Intersecting

point of intersection

Lines, rays, segmentsthat meet

Perpendicular

right angle

Lines, rays, segmentsthat meet at right

angles

Angleformed by 2 rays or

segments that have the same endpoint

vertex

Right anglean angle that is 90º

Acute anglean angle that is less than

90º

Obtuse anglean angle that is

between 90º and 180º

Straight anglean angle that is 180º

Reflex anglean angle that is

between 180º and 360º

Trianglea polygon with 3 sides

Scalene Trianglea triangle with all sides

of different lengths

Isoceles Trianglea triangle

with two sides of same length

Equilateral Trianglea triangle

with all sides of equal length

Right Trianglea triangle

with one right angle

Obtuse Trianglea triangle

with one obtuse angle

Acute Trianglea triangle

with all acute angles

Quadrilaterala polygon

with 4 sides

Trapezoida quadrilateral

with 1 pair of parallel sides

Parallelograma quadrilateral

with 2 pairs of parallel sides

Rhombusa quadrilateral

with all sides equal length

Rectanglea parallelogram

with 4 right angles

Squarea rectangle

with all sides equal

Kitea quadrilateral with 2

pairs of adjacent equal sides

Pentagona polygon with 5 sides

Regular pentagon Irregular pentagon

Hexagon

Regular hexagon Irregular hexagon

a polygon with 6 sides

Heptagona polygon with 7 sides

Regular heptagon Irregular heptagon

Octagona polygon with 8 sides

Regular octagon Irregular octagon

Nonagona polygon with 9 sides

Regular nonagon Irregular nonagon

Decagona polygon with 10 sides

Regular decagon Irregular decagon

Undecagona polygon with 11 sides

Regular hendecagon

Irregular hendecagon

Dodecagona polygon with 12 sides

Regular dodecagon

Irregular dodecagon

Circlea curved line that forms a

closed path on a flat surface

Polygona closed, 2-dimensional figure made up of line

segments joined end to end

Congruentexactly the same shape

and sizeA

B

CD

Symmetricalhaving the same size and

shape on either side of a line

Regular Polygona polygon

with all sides of equal length

Irregular Polygona polygon

with sides of different lengths

Convex Polygona polygon with all

vertices pushed outward

Concave Polygona polygon with at least

one vertex pushed in

Polyhedrona closed 3-dimensional figure whose surfaces

are made up of polygons

Spherea 3D shape

with a single curved surface

Conea 3D shape

with a circular base,a curved surface, and one

vertex

Cylindera 3D shape

with 2 congruent circular bases

connected by a curved surface

Cubea polyhedron

with 6 square faces

Pyramida polyhedron

that has a base and triangular faces meeting at

a point (vertex)

Triangular pyramid

Square pyramid

Rectangular pyramid

Pentagonal pyramid

Hexagonal pyramid

Prism

Triangular prism

Squareprism

Rectangular prism

Pentagonal prism

Hexagonal prism

a polyhedronthat has two identical bases and all flat sides