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= 2 . 3,14 . 10 . 10 + 628
= 6,28 . 100 + 628
= 628 + 628
= 1256 cm²
2. LPT = 2πr ( r + t )
528 = 2 . 22/7 . 7 ( 7 + t)
528 = 44 ( 7 + t )
528/44 = ( 7 + t )
( 7 + t ) = 528/44
7 + t = 12
t = 12 - 7
t = 5 cm