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22/7 x 3,5 ( 3,5 + 2x 20 )
22/2 ( 43,5)
11 x 43,5
= 478,5
B.
S² = r² + t²
S² = 3,5² + 20²
S² = 12,25 + 400
S² = 412,25 = 412
S = 20,29 = 20,3
luas selimut tabung = phi r s
3,14 x 3,5 x 20,3
10,99 x 20,3
= 223,097 = 223
luas permukaan = phi r ( r + s )
22/7 x 3,5 (3,5 + 20,3)
22/2 x 23,8
11 x 23,8
= 261,8