CAYLEY 2010 Problem 21

A rectangular piece of paper measures 17\:cm by 8\:cm. It is folded so that a right angle is formed between the two segments of the original bottom edge, as shown. What is the area of the new figure?

Image

Answer Choices
A. 104\:cm^2
B. 81\:cm^2
C. 72\:cm^2
D. 168\:cm^2
E. 64\:cm^2