It has 70 but nobody other than a Greek or a pretentious snob would call it that.
The answer is a heptacontagon is a 72-sided polygon.
It is called heptacontagon.
A 70 sided shape is called a heptacontagon.
heptacontagon is the scientific term for a 70 sided shape.
I reckon, if a 70 sided shape is called a heptacontagon, and a 50 sided shape is called a pentacontagon, then a 40 sided shape might be called a quadracontagon, or something along those lines.
hexagon has 6 sides
7
5
It's perfectly acceptable to call it a 70-agon but what is more important is that you can work out its properties
No Man's Land is the name of the space between the two sides front lines.
flexitarian
It has 12 sides. This type of polygon is called a dodecagon