Yes, it is a plane shape. It is a polygon, a shape which is bounded by ten straight sides.
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If it lies in a plane, it is a decagon.
They are all polygons which means that they are plane areas enclosed by straight sides. A heptagon has 7 sides, a nonagon has 9 and a decagon has 10.
Decagon. A decagon is the name of a ten sided shape.
A plane figure bounded by some numbers of straight sides is called a polygon. Thus a polygon with ten-sided is called a decagon.
decagon