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K lingkaran = 2 x pi x r
62,8 = 2 x 3,14 x r
62,8 = 6,28 x r
62,8/6,28 = r
628/10 x 100/628 = r
10 = r
Lpermukaan tabung = 2 x pi x r x (r + t)
= 2 x 3,14 x 10 x ( 10 + 30 )
= 6,28 x 10 x 40
= 2512 cm²