def arrowheadCoordsForSide(s):
	"""
	Upwards pointing equilateral triangle with equal sides s
	origin = 0,0
	"""
	factor = 3**0.5/2
	coords = (
		( # path
			(0,0), (s/2,factor*s/4), (s,0), (s/2,factor*s),
		),
	)
	return coords