Find the area of a square whose diagonal is $5\sqrt{2} \mathrm{cm}.$ 

If the area is k ${\text{cm}}^2$ , then write the value of k.

Calculate the area of the shaded region given below:

If the area is k ${\text{m}}^2$ , then write the value of k.

The area of the shaded region given below$=$_____${\mathrm{m}}^2$.

The area of the shaded region given below$=$_____${\mathrm{m}}^2$.

The area of the shaded region given below$=$_____${\mathrm{cm}}^2$. (all measures are given in $\mathrm{cm}$):

Calculate the area of the shaded region given below (all measures are given in $\mathrm{cm}$) (Write the answer without unit)

Calculate the area of the shaded region given below (all measures are given in $\mathrm{cm}$):

If the area is k ${\text{cm}}^2$ , then write the value of k.