Find the diameter of a circle whose circumference is $88 \mathrm{cm}$.

If the diameter of a circle whose circumference is $44$ is $k$ units, then find the value of $k$

The area of a rectangle whose length and breadth are $45 \mathrm{cm}$ and $16 \mathrm{cm}$ is $k {\mathrm{cm}}^2$, find $k$.

If the area of a square whose sides are $14 \mathrm{cm}$ long is $k {\mathrm{cm}}^2$, then find $k$.