Yes
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I think that is an octagon
A square, pentagon, decagon, octagon are always regular polygons.
The area of a polygon is not enough to determine its shape - unless it is a regular polygon. There is nothing in the question to suggest that the octagon is regular.
its an Octagon
On a regular polygon (the octagon that was represented to you in grade 2), its usually 45 degrees. Although, an octagon is any polygon with eight sides so it doesn't have to be regular, it can be any shape with sides. So it may be different for your octagon.