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3080=22/7.7.7.t
t=3080/154
=20 cm
Lp tabung=2πr(r+t)
=2.22/7.7(7+20)
=44.27
=1188 cm²
3080= 22/7 x 7² x t
3080=154 t
20 = t
LP= 2 x 22/7 x 7² + 22/7 x 14 x 20
= 308 + 880
= 1188 cm²