A 2D shape with eight sides is called an octagon. The term "octagon" is derived from the Greek words "okto," meaning eight, and "gonia," meaning angles. Regular octagons have equal side lengths and angles, while irregular octagons can vary in size and shape. A common example of an octagon is a stop sign.
-6
Octohedron
In 2-d, a heptagon.
A 9-sided shape is known as a nonagon.
A regular polygon with an even number of sides.
-6
How about a triangle which is a 2 dimensional shape with 3 sides
A quadrilateral is a 2D shape that has 4 sides
A 2-D shape with seven sides is called a HEPTAGON.
A dodecagon has 12 sides.
-2
cube
a pentagon
Hexagon
A square
Octohedron
Nonagon