In this task, you need to answer the given multiple-choice question on geometry. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

[EX Q]: Problem: if circles x and y have the same area and circle x has a circumference of 12 , half of the radius of circle y is :
Options: a ) 16 , b ) 8 , c ) 3 , d ) 2 , e ) 1
[EX A]: c

[EX Q]: Problem: the radius of a cylindrical vessel is 7 cm and height is 3 cm . find the whole surface of the cylinder ?
Options: ['a ) 520 sq cm', 'b ) 840 sq cm', 'c ) 440 sq cm', 'd ) 120 sq cm', 'e ) 5 sq cm']
[EX A]: c

[EX Q]: Problem: the radius of a cylinder is 6 m , height 21 m . the total surface area of the cylinder is ?
Options: a ) 525 , b ) 528 , c ) 522 , d ) 529 , e ) 521
[EX A]:
b