The answer is a heptacontagon is a 72-sided polygon.
It has 70 but nobody other than a Greek or a pretentious snob would call it that.
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.
It's perfectly acceptable to call it a 70-agon but what is more important is that you can work out its properties
a crescent has 19 sides
how many sides does an polygonshave
10 sides.
Oh, dude, a 1234567890 sided shape is actually called a nonagon. Yeah, it's like a polygon with nine sides. So, if you ever need to impress someone with your geometry skills, just drop that little fun fact on them.
There is no formula for how many sides there are in a polygon; the name of the polygon shows how many sides it has.
How many sides does a Decahedron Have