Question

Carilah luas permkaan tabung jika tinggi tabung 12 inci dan keliling alas 37,68 inci (pi =3,14)

Answer 1

Keliling alas tab = kel lingkaran = 2πr
37,68 = 2.3,14.r
r = 37,68/6,28
r = 6 inci

luas permukaan tabung = 2πr(r+t)
 = 2.3,14.6(6+12)
 = 37,68.18
 = 678,24 inci²

Answer 2

keliling alas tab = kel lingkaran = 2πr
37,68 = 2.3,14.r
r = 37,68/6,28
r = 6 inci

luas permukaan tabung = 2πr(r+t)
 = 2.3,14.6(6+12)
 = 37,68.18
 = 678,24 inci²