Find the circumference of a circle whose diameter is $14 \mathrm{cm}$.

Find the circumference of a circle whose diameter is $28 \mathrm{cm}$.

Find the circumference of a circle whose diameter is $10 \mathrm{cm}$.

Find the circumference of a circle whose diameter is $7 \mathrm{cm}$.

Find the radius of a circle whose circumference is $44 \mathrm{m}$.

Find the radius of a circle whose circumference is $22 \mathrm{cm}$.

Find the radius of a circle whose circumference is $66 \mathrm{m}$.

Find the radius of a circle whose circumference is $30.8 \mathrm{m}$.

Find the perimeter of the figure.