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caranya:
R= D/2=14/2=7
luas permukaan tabung=
2.22/7(7+16)
=44 × 23
=1012
-------------------------------------------
r=d:2
r=14:2
r=7 dm
Luas permukaan tabung: 2 x phi x r (r + t)
=2x22/7x7(7+16)
=2x22/7x7x23
=44/7x161
=7084/7
=1012 dm²