Detailed Instructions: 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:Problem: if the sides of a triangle are 30 cm , 40 cm and 50 cm , what is its area ? 
Options: a ) 400 , b ) 500 , c ) 550 , d ) 600 , e ) 700
Solution:
d