The answer depends on the specific shape and size of the decagon.
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154 square feet.
It depends on whether or not the decagon is a perfect decagon or a complex decagon. However, a perfect decagon has no acute angles.
10279 square feet.
What polygon has 2 fewer sides than an decagon
No. They are quite different. They are the same only in the case of one square foot and one foot square. One square foot is a square, one foot on a side. Ten square feet is an area equal to ten of these square feet. Ten feet square is a square, ten feet per side. Ten square feet contains an area of ten square feet. Ten feet square contains an area of 100 square feet.