Definition: In this task, you need to answer the given multiple-choice question on geometry. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.
Input: Problem: if the sides of a triangle are 26 cm , 24 cm and 20 cm , what is its area ? 
Options: a ) 120 , b ) 772 , c ) 288 , d ) 266 , e ) 240
Output:
e