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: how many internal diagonals does a heptagon ( seven sided polygon ) have ? 
Options: a ) 7 , b ) 9 , c ) 14 , d ) 20 , e ) 35
[EX A]: c

[EX Q]: Problem: find the smallest number that should be multiplied with 54000 to make it a perfect cube . 
Options: ['a ) 4', 'b ) 5', 'c ) 6', 'd ) 3', 'e ) 7']
[EX A]: a

[EX Q]: Problem: a semicircle has a radius of 10 . what is the approximate perimeter of the semicircle ? 
Options: a ) 27 , b ) 33 , c ) 39 , d ) 45 , e ) 51
[EX A]:
e