you said 4 pi times 6 to the second power.thats 452.38934236
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Pi to the 5th power is approximately 306.019684785
12
Because the 2cm lens has 4 times the area of a 1cm lens. (area = Pi*r2)
-2 times -2 = plus 4 since minus times minus is plus
2 times 4 times pi (3.14)