Answer: 4.5 cm
Explanation:
Here, Hexagon D and hexagon H are regular hexagons.
And, according to the question,
Hexagon D is dilated to hexagon H.
Here the scale factor of dilation is 0.25 or 1/4.
Thus, if the side of hexagon D = 18 cm
⇒ Then the side of hexagon H = 18 × 1/4 = 18/4 = 4.5 cm
Thus, the length of one side of hexagon H is 4.5 cm.