O=2a+2b a,b boki prostokąta
a=1\frac{1}{2}b=1,5b
2 * 1,5b+2b=8,25
3b+2b=8,25
5b=8,25/ :5
b=1,65 =1\frac{65}{100}=1\frac{13}{20}
a=1\frac{1}{2}b=\frac{3}{2} * 1\frac{13}{20}=
a=\frac{3}{2}*\frac{33}{20}=\frac{99}{40}=2\frac{19}{40}
P=a * b =2\frac{19}{40} * 1\frac{13}{40} =
P= \frac{99}{40} * \frac{33}{20}=\frac{3267}{800}=4\frac{67}{800}(m^2)\approx4m^2