A square with a side length of 1 meter has an area of 1 square meter; a square with a side length of 2 meters has an area of 4 square meters; a square with a side length of 3 meters has an area of 9 square meters; a square with a side length of 1 meter has an area of 36 square meters rice.
边长1米的正方形，面积是1平方米；边长2米的正方形，面积是4平方米；边长3米的正方形，面积是9平方米；边长多少米的正方形，面积是36平方米．
<result>6</result>