Bantuin sampe 8 dong ka

Jawab =
diameter = 7 cm, jari jari = 3,5 cm
tinggi tabung = 18 cm
Luas permukaan tabung tanpa tutup
= Πr(r+2t)
= 22/7×3,5(3,5+2(18))
= 11 (3,5+36)
= 11 (39,5)
= 434,5 cm² (C)