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2156=22/7*r2*14
2156:44
154 jawabannya
r²=V÷(πt)
r²=2156÷(22/7. 14)
r²=2156÷44
r=√49
r=7 cm
Luas Permukaan tabung
=2πr(r+t)
=2. 22/7. 7 (7+14)
=44(21)
=924 cm²