If the area of a rectangle whose length $=46 \mathrm{cm}$ and breadth $=25 \mathrm{cm}$ is $A {\mathrm{cm}}^2$, then find the value of $A$.

If the area of a rectangle whose length $=9 \mathrm{m}$ and breadth $=6 \mathrm{m}$ is $k {\mathrm{m}}^2$, then find $k$.

If length $=14.5 \mathrm{m}$ and breadth $=6.8 \mathrm{m}$, then area of a rectangle$=$_____${\mathrm{m}}^2$.

If the area of a rectangle whose length$=3.5 \mathrm{km}$ and breadth$=2 \mathrm{km}$ is $A {\mathrm{km}}^2$, then find the value of $A$.