40-gon.
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A forty-sided shape is called a tetracontagon. The prefix "tetra-" signifies the number four, and "-contagon" denotes a polygon with a specified number of sides. In geometry, polygons are classified based on the number of sides they have, with a tetracontagon being a specific type of polygon with forty sides.
A 40 sided polygon is call a Tetracontagon. Try saying that ten times fast. :) Hope this helped.
A five-sided polygon is called a pentagon.
A 39 sided polygon is called a 39-gon.
A thousand-sided polygon is a chiliagon.