Let the area of a square is $9 {\mathrm{cm}}^2$. What would be the new area, if its side is reduced by $1 \mathrm{cm}$?

In the given Fig., if perimeter of the shape is $67 \mathrm{cm}$, the value of $x$ is

In the given Fig., $ABCD$ is a square and $PQR$ is an equilateral triangle. The difference between the perimeters of these two geometrical shapes is

In the Fig., a semicircle and a square are shown. If side of the square is equal to the radius of the semicircle, then perimeter of the semicircle is