According to the meaning of the question, a=3\2b, the rectangular area can be expressed as the square of b*3\2b =3/2 b, and the swimming pool area is 3/2b* 1/2*3/2b=3/8b square. The square of the swimming pool area is (1/2b *1/2) * π *1/2 =1/32b. According to the meaning of the question, the green area should reach half of the rectangular area, that is, the square of 3/2b * 1/2=3/4b.

Comparison: 3/4b square (green area) > 3/8b square+1/32b square π (swimming pool area and rest area area).

A: Xiaohua's design meets the requirements.