A park is circular in shape. The central portion has playthings for kids surrounded by a circular walking pathway. Find the walking area whose outer radius is $10 \mathrm{m}$ and inner radius is $3 \mathrm{m}$.

The radius of a circular flower garden is $21 \mathrm{m}$. A circular path of $14 \mathrm{m}$ wide is laid around the garden. Find the area of the circular path.

A Kho-Kho ground has dimensions $30\mathrm{m}\times 19\mathrm{m}$ which includes a lobby on all of its sides. The dimensions of the playing area is $27 \mathrm{m}\times 16 \mathrm{m}$. Find the area of the lobby.