Solve this

30.  Jay Pravesh, a juice seller has set-up his juice shop. He has three types of glasses of inner diameter 5 cm to serve the customers. The height of the glasses is 10 cm. (Use = 3.14)

He decided to serve the customers in 'A' type of glasses. 

 i)     Find the volume of glass of type A.
(ii)   Which glass has the minimum capacity ?
(iii)  Which mathematical concept is used in above problem ?
(iv)   By choosing a glass of type A, which value is depicted by juice seller ?