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 sides of a triangle are 26 cm , 24 cm and 12 cm , what is its area ?
Options: a ) 144 , b ) 772 , c ) 288 , d ) 266 , e ) 2848
a

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']
c

Problem: the area of a circle is increased by 300 % . by what percent has the diameter of the circle increased ?
Options: ['a ) 400 %', 'b ) 200 %', 'c ) 300 %', 'd ) 100 %', 'e ) 800 %']
d