A decagon cannot be a parallelogram. In a parallelogram, the opposite sides are parallel to each other. in a decagon, some of the opposite sides would go in different directions.
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It depends on whether or not the decagon is a perfect decagon or a complex decagon. However, a perfect decagon has no acute angles.
Decagon.
it's a decagon.
yes a decagon can tile!!!!!!!!!!
A decagon has ten vertices.