Thank you very much for your input guys. I ordered the A4 size paper from amazon and measured it with a scale(ruler) and the paper was 29.7 cm x 21.1 cm . I had to print the forms several times to get it to print the right dimensions. After several experiments I was able to print the required size:
Printed area: 27cm x 18.5cm (Length and Breadth)

I also had trouble with the finger prints. They don't want the finger prints to touch the rectangular border. I had to print the form so many times to get the finger prints between those tiny boxes.

I hope they wont reject my application. I may keep updating this post so that others may find it useful.
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Application Packet included the following:
=> 2 passport renewal forms (black and white copies not colored)
=> Original Passport + 2 copies
=> Original Citizenship certificate + 2 copies
=> 3 colored photographs(taken at cvs pharmacy for US passport: 2 inches by 2 inches) in a small plastic zip
=> A 9 inch by 12 inch prepaid envelope with tracking with my return address
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Date Application dropped to USPS: June 23 2015
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