Question

Answer 1

Answer 2

Answer 3

Nửa chu vi hcn là: 9/10:2=9/20(m)

CD hcn là: (9/20 +1/20):2=1/4(m)

CR hcn là: 09/20-1/4=1/5(m)

S hcn là: 1/4.1/5=1/20(m^2)

Answer 4

Answer 5

Nửa chu vi hcn là: \(\dfrac{9}{10}\):2= \(\dfrac{9}{20}\)(m)

 Chiều dài HCN là:  (\(\dfrac{9}{20}\) + \(\dfrac{1}{20}\)) : 2 = \(\dfrac{1}{4}\) (m)

Chiều rộng HCN là:  \(\dfrac{9}{20}\) - \(\dfrac{1}{4}\) = \(\dfrac{1}{5}\) (m)

Diện tích HCN là:  \(\dfrac{1}{4}\) x  \(\dfrac{1}{5}\)= \(\dfrac{1}{20}\) (\(^{m^2}\))