A shape in 2D with n sides is called an n-gon.
In higher dimensions, a shape with n sides is called an n-sided polyhedron.
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Septagon or Heptagon = seven sided shape
A 3-sided shape is called a triangle.or Polygon in general.
an n-gon
A 4 sided shape is classified as a quadrilateral.
The equation to find the size of the interior angle of an n sided shape is (n-2)180/n For a 120 sided shape, you need to plug n=120 into this equation. (120-2)180/120 =118x180/120 =177 Thus a 120 sided shape does have an angle of 177 degrees, and the statement in the question is true.