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Jawab
K.alas=2phi.r
r=k.alas\2phi
=88/2x22/7
=14
luas alas?
luas alas=phi.r*
=22/7.14.14
=44x14
=616
luas selimut?
=2phi.r.t
=2x22/7x14x25
=2.200
luas permukaan tabung?
phi.r(r+t)
22/7.14(14+25)
44×39
1716