Chiều dài : \(3\frac{1}{2}=\frac{3x2+1}{2}=\frac{7}{2}\)(dm)
Chiều rộng :\(2\frac{1}{3}=\frac{2x3+1}{3}=\frac{7}{3}\)(dm)
Chu vi : \(\left(\frac{7}{2}+\frac{7}{3}\right)x2=\frac{35}{6}x2=\frac{35}{3}\)(dm)
Diện tích :\(\frac{7}{2}x\frac{7}{3}=\frac{7x7}{2x3}=\frac{49}{6}\)(dm2)