Find the area of the shaded figure

A kind-hearted fellow was walking through Central Park in New York and was astonished to see an old man, fishing rod in hand, fishing over a beautiful bed of lillies.

"Tch Tch!" said the passerby to himself. "What a sad sight. That poor old man is fishing over a bed of flowers. I'll see if I can help."

So the kind fellow walked up to the old man and asked, "What are you doing, my friend?"

"Fishin', sir."

"Fishin', eh. Well how would you like to come have a drink with me?"

The old man stood up, put his rod away and followed the kind stranger to the corner bar. He ordered a large glass of beer and a fine cigar.

His host, the kind fellow, felt good about helping the old man, and he asked, "Tell me, old friend, how many did you catch this morning?"

The old fellow took a long drag on the cigar, blew a careful smoke ring and replied, "You are the sixth today, sir!"