Is it difficult? Still no time to calculate the exam? Calculated PQRS area of external wall is10.2m? , and then multiplied by 0.23 and 0.27 respectively, the range of window area S is 2.346≤S≤2.754, and the areas of the four options are π≈3. 14, √3≈ 1.732, 2.25 (maybe the option is wrong, it should be a square or a rectangle with the same circumference.