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

Problem: if the height of a cone is increased by 160 % then its volume is increased by ? 
Options: a ) 100 , b ) 777 , c ) 998 , d ) 729 , e ) 160
e

Problem: a rectangular field is to be fenced on three sides leaving a side of 20 feet uncovered . if the area of the field is 800 sq . ft , how many feet of fencing will be required ? 
Options: a ) 100 feet , b ) 120 feet , c ) 150 feet , d ) 180 feet , e ) 186 feet
a

Problem: what is the area of a square field whose diagonal of length 10 m ? 
Options: a ) 50 , b ) 70 , c ) 60 , d ) 20 , e ) 25

a