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6930 =22/7 . 10.5 . 10.5 . t
6930 = 346.5 . t
6930/346.5 = t
20 = t
lp = 2πr (r+t)
= 2. 22/7 . 10.5 ( 10.5 +20 )
= 44/7 . 10.5 . 30.5
= 2013 cm²