The area of the largest circle, that can be drawn inside

Fish : Aquarium ::  Birds : ? 

Select the combination of numbers that when placed sequentially in the blanks of the given series will complete the series.

In the following question, select the related number from the given alternatives.

72 : 11 :: 65: ?

Identify the analogy: "Hand is to fingers as foot is to __________."

63 :  45 : : 85 : ?

Select the option in which the numbers share the same relationship as that shared by the numbers in the set given below:

(480, 238, 484)

Theatre : Actor :: Field : ?

Select the option that is related to the third word in the same way as the second word is related to the first word.

Happy: Sad :: Generous: ?

Select the combination of letters that when sequentially placed in the blanks of the given letter series will complete the series.