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: the area of a triangle is with base 4 m and height 6 m ? 
Options: a ) 11 m 2 , b ) 10 m 2 , c ) 18 m 2 , d ) 19 m 2 , e ) 12 m 2
[EX A]: e

[EX Q]: Problem: the parameter of a square is equal to the perimeter of a rectangle of length 9 cm and breadth 6 cm . find the circumference of a semicircle whose diameter is equal to the side of the square . ( round off your answer to two decimal places ) ? 
Options: a ) 11.72 , b ) 11.52 , c ) 11.97 , d ) 10.91 , e ) 11.79
[EX A]: e

[EX Q]: Problem: what is the sum of the squares of the first 20 natural numbers ( 1 to 20 ) ? 
Options: ['a ) 2870', 'b ) 2000', 'c ) 5650', 'd ) 6650', 'e ) 7650']
[EX A]:
a