Question

If X = 2 centimeters, Y = 6 centimeters, and Z = 6 centimeters, what is the area of the object?

Answer 1

In order to answer the question, it's absolutely essential to have
enough of a description of the object to know which of its parts 
'X', 'Y', and 'Z' are, and what other parts it may have.

An ideal way to accomplish this would have been for you to include the
picture that accompanies the question, wherever you copied it from.