regular polygon
[noun]
a two-dimensional closed shape with straight sides and equal angles between adjacent sides, and all sides have the same length
Colors and Shapes - Polygons
Read this lesson to learn the names of polygons in English, such as "convex polygon", "heptagon" and "hendecagon".
review
flashcard
spelling
quiz
irregular polygon
[noun]
a polygon that does not have all sides or angles equal in size or measure, making it non-regular and lacking symmetry
convex polygon
[noun]
a geometric shape that has all its interior angles measuring less than 180 degrees, causing the polygon to curve outward
concave polygon
[noun]
a geometric shape that has at least one angle measuring greater than 180 degrees, causing the polygon to curve inward
pentagon
[noun]
a geometric shape with five angles and five straight sides
Ex:
The
stop sign
is
shaped
like
a
red
pentagon
to
alert
drivers
to
halt
.
hexagon
[noun]
(geometry) a closed shape with six straight sides and six angles
Ex:
She
decided
to
tile
her
bathroom
floor
with
hexagon-shaped
tiles.
heptagon
[noun]
a seven-sided plane shape consisting of seven line segments or edges that meet at seven interior angles
Ex:
One
version
of
the
game
featured
a
board
laid out
in
a
grid
of
non-uniform
heptagons
instead of
the
usual
squares
.
octagon
[noun]
(geometry) a polygon consisting of eight straight sides and eight angles
Ex:
Each
of
the
eight
sides
of
the
octagon
was
painted
a
different
color
.
decagon
[noun]
(geometry) a flat polygon with ten straight sides and ten angles
Ex:
Architects
sometimes
incorporate
shapes
like
the
decagon
into
their
designs
for
a
unique
appearance
.
hexagram
[noun]
(geometry) a flat star-shaped figure with six points that can be formed by making equilateral triangles on each side of a regular hexagon
trilateral
[noun]
a three-sided geometric shape
Ex:
The
graphic designer
incorporated
a
trilateral
into
the
logo
design
.