keliling alas sebuah tabung 88 cm . jika tinggi tabung 20 cm , hitunglah volume tabung tersebut?

keliling tabung = 2× phi ×r = 88
88 = 2 × 22/7 × r
88 = 44/7 ×r
r = 7/44 ×88
r = 14 cm
tinggi tabung = 20 cm
volume tabung = phi ×r^2 × t
= 22/7 × 14 ×14 × 20
= 44× 280
= 12.320 cm^3