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1540 = 22/7 X r2 X 10
1540 X 7 = 22 X 10 X r2
10780 = 220 X r2
10780/220 = r2
49 = r2
7 = r
Lp = 2 . phi . r2 + 2 . phi . r . t
= 2 X 22/7 X 49 + 2 X 22/7 X 7 X 10
= 308 + 440
= 748 cm2