carilah luas tabung jika tinggi tabung 12 inci dan keliling alas 37,68 inci

k= 3,14 × d
37,68 = 3,14 d
d = 37,68 ÷ 3,14
d = 12

r= 6 inci

lp=2 × 3,14 × 6 × 6 × 37,68 × 12
lp =102224,3328 inci²

L tabung = 2πr(r+t)

k= π.d
37.68=3.14*d
37.68/314=d
12=d
r= 6

L= 2πr(r+t)
L=keliling alas(r+t)
L=37.68(6+12)
L=678.24 inchi