measure the perimeter then measure from the EXACT center to a side multiply this only works on regular decagons!
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BxH times the coeficent of the hypotenuse. This will be proportional to the domain.
Find any straight side of the decagon. Move along it until it joins another side. That is where an angle is. An angle of a decagon can have any measure between 0 and 360 degrees (except 180 degrees).
The formula for determining the area of a decagon is A = 2.5dt where t is the length of one edge and d is the distance between two parallel sides
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Decagon