Calculate, correct to two decimal places, the area of the circle with diameter \({\rm{13~m}}{\rm{.}}\)

What is the area of the circle with diameter \({\rm{6}}{\rm{.4~m}}\) correct to one decimal place.

What area is needed to make a solid wheel of diameter \({\rm{220}}{\rm{.8~mm?}}\) Give your answer in \({\rm{c}}{{\rm{m}}^2}{\rm{ (1dp)}}{\rm{.}}\) 

The area of a CD is approximately \({\rm{91}}{{~\rm{cm}}^2}{\rm{.}}\) What is its radius? (1dp)

For the given circle, find its area

Find the area of the shaded region in the following shape 

Calculate the area of the following annulus, correct to 2 decimal places.

Find the area of a circle with diameter of 3.7 m (1 decimal place)    

Find the area of the annulus with a large diameter of 12 cm and the small diameter of 7 cm (1 decimal place)

Find the shaded area (nearest whole number).