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t=8
a).
Luas selimut
=2πrt
=2. 22/7. 3,5 . 8
=22.8
=176 cm²
b).
Luas permukaan
=2πr(r+t)
=2. 22/7. 3,5(3,5+8)
=22(11,5)
=253 cm²