a)
m,n boki prostokąta
Obw. =2m+2n=2*6+2*2\frac{1}{4}=12+4\frac{2}{4}=16\frac{1}{2}
P=m*n=6*2\frac{1}{4}=12\frac{6}{4}=13\frac{2}{4}=13\frac{1}{2}
b)
a,b boki prostokata
Obw=2*1\frac{1}{4}+2*4=2\frac{2}{4}+8=10\frac{1}{2}
P=a*b=1\frac{1}{4}*4=4\frac{4}{4}=5