Jhon arrives with the proper gear to put air in the ball, what is the Volume of the ball?

----- Nội dung dịch tự động từ ảnh -----
Do the exercises
1) The football ball has no air, and it is completely flat.
The diameter of this sphere is of 11 cm .. What is the radius ? And the circumference ?
How much area does the flat ball occupies?
Jhon arrives with the proper gear to put air in the ball, what is the
Volume of the ball ?