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luas alas tabung= phi r^2
=3,14×15×15= 706,5
luas 1/2 bola=2 phi r^2
=2×3,14× 15×15
=1413 cm^2
luas total= 3956,4+706,5+1413=6075,9 cm^2
4. volume tabung= phi r^2t
385=3,14×3,5×3,5×t
t= 385/38,465
t=10
luas selimut tabung=2 phi rt
=2×3,14×3,5×10
=219,8 cm^2