What will be the area of a semi-$circle$ whose perimeter is $36 \, cm$? (in $cm^2$)

Three equal cubes are placed adjacently in a row. Find the ratio of the total surface area of the new cuboid to the sum of the surface areas of the three cubes.

If the area of a square is $50$ $sq$ units,then the area of the circle drawn on its diagonal is

If the sides of a rectangle are increased by $20 \%$,the percentage increase in its perimeter is

The circumference of two circles is $88 \text{ m}$ and $220 \text{ m}$ respectively. What is the difference between the area of the larger circle and that of the smaller circle (in $m^2$)?

$A$ garden is $24\, m$ long and $14\, m$ wide. There is a path $1\, m$ wide outside the garden along its sides. If the path is to be constructed with square marble tiles of $20\, cm \times 20\, cm$,then find the number of tiles required to cover the path.