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Luas selimut=3108
t =20cm
Dit : a. Luas Selimut?
b. Luas permukaan tabung?
Jawab :
a.Luas permukaan Tabung= 2×phi×r(t+r)
= 2×22/7×7(20+7)
= 308(27)
= 8.316/7
= 1.188cm
b. Luas Selimut Tabung: phi×r×t
22/7×7×20
=3.080/7
=440cm