The area of the square base of a right pyramid is $64{ \mathrm{cm}}^2.$ If the area of each triangle forming the slant surface is $20{ \mathrm{cm}}^2$, then the volume of the pyramid is :

In the adjoining figure $\mathrm{AB}=\mathrm{CD}=2\mathrm{BC}=2\mathrm{BP}=2\mathrm{CQ}.$ In the middle, a circle with radius $1 \mathrm{cm}$ is drawn. In the rest figure all are the semicircular arcs. What is the perimeter of the whole figure?

The perimeter of the figure given below (correct to one decimal place) is: