octagon
An Octagon
An 8 and a 3
--any shapes with proportionally equal sides are "Similar" if you had a rectangle with one side hat was 4 and the other 8 and another rectangle with sides 8 and 16, you would have proportionally equal sides because (4/8)=(8/16)
Congruent figures are similar - in sides as well as angles. Corresonding angles of similar figures congruent but their sides are not. The sides are all in some fixed ratio. [If that ratio is 1, the figures are congruent.]
the any sides of figures.....
Corresponding Sides
I assume you mean 4 congruent sides or 2 pairs of congruent sides.. (There are no 4-sided figures with 8 sides.) A square.
A Quadrilateral. Figures that have four equal sides are called squares. Whereas, other figures that have four unequal sides are called quadileterals
Here are some figures that have a number of sides that is a composite number:Two-dimensional figures includesquarehexagonoctagonnonagonThree-dimensional figures includetetrahedroncubeoctahedronicosahedron
2 dimensional (plane) figures can have three or more straight edges as sides. 3 dimensional (solid) figures can have four or more plane sides (faces). They can have fewer sides if the sides are not straight.
Pentagons
There are 8 sides in the polygon with 8 sides (an octagon).