The area of a parallelogram is $60 {\mathrm{cm}}^2$ and the base of the parallelogram is $12.5$ $\mathrm{cm}$. If its altitude is $h \mathrm{cm}$, find the value of $h$ in decimal.

The area of the portion $PQORSP$ is $k {\mathrm{cm}}^2$. Find $k$.

The area of a quadrilateral whose diagonal measures $24$ $\mathrm{cm}$ and the lengths of the perpendiculars on it from the opposite vertices are $6.4$ $\mathrm{cm}$ and $7.6$ $\mathrm{cm}$ respectively is $k {\mathrm{cm}}^2$. Find $k$.

The area of the given figure where $\mathrm{PQRS}$ is a rectangle of length $\mathrm{RS}=20 \mathrm{cm}$ and breadth $\mathrm{QR}=14 \mathrm{cm}$ is $k {\mathrm{cm}}^2$. Find $k$.

From a circular disc of radius $28 \mathrm{cm}$, two circles of radius $\frac{7}{2} \mathrm{cm}$ each, a triangle of base $3 \mathrm{cm}$ and height $2 \mathrm{cm}$, a rectangle of length $4 \mathrm{cm}$ and breadth $3 \mathrm{cm}$ are cut out. The area of the remaining disc is $k {\mathrm{cm}}^2$. Find $k$.

The area of a square of side $2.3 \mathrm{cm}$ is _____ ${\mathrm{cm}}^2$.

_____ is the distance around a closed figure.

If the area of a circular ring with outer and inner radii as $\mathrm{R}$ and $\mathrm{r}$, respectively is $\mathrm{\pi k}(\mathrm{R}+\mathrm{r})$, then find $\mathrm{k}$.

A square and a parallelogram have equal areas. If the side of the square is $30 \mathrm{m}$ and the height of the parallelogram is $15 \mathrm{m}$, find the length of the parallelogram.