It can be, if its sides all have the same length.In that case, it would also be called a 'square'.
An octagon is a polygon that has 8 sides
Hexagon
360/18 ie 20 sides
It wil be a regular 18 sided polgon
A polygon with ten sides would be called a decagon.
how many sides does an polygonshave
'What_is_the_longest_side_of_a_right_angle_triangle_called
It can be, if its sides all have the same length.In that case, it would also be called a 'square'.
An octagon is a polygon that has 8 sides
Heptagon
Hexagon
A pentagon
there is such a thing as an irregular polygon that has sides of different sizes. all REGULAR polygons however have equal sides
360/18 ie 20 sides
A polygon is a closed 2-D shape with sides made from straight line segments.
60 sides 180-174 = 6 360/6 = 60