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2200=2. 22/7. r. 25
2200/2=550/7 . r
1100 . 7/550 = r
14=r
.
Ltabung=2πr(r+t)
=2. 22/7. 14 (14+25)
=88 . 39
=3432 cm^2
.
maaf ya kalau hitunganny salah