human
Can you provide a code to diagonal of a Regular Decagon and the other steps required given the following:
Diagonal of a Regular Decagon | Function to return the diagonal of a regular decagon.
Side cannot be negative.
Length of the diagonal.
Driver code"
How can the above be solved in Python?
assistant
#Here is code to diagonal of a Regular Decagon and the other steps required.
 def decdiagonal ( a ) :
	if ( a < 0 ) :
		return - 1
	d = 1.902 * a
	return d
if __name__ == " _ _ main _ _ " :
	a = 9
	print ( decdiagonal ( a ) )