jwab plss pke cara plsss

V = pi x r² x t
   = 22/7 x 7² x 30
    = 22 x 7 x 30
    = 4.620 cm³

28. v. tabung = pi * r * r * t = 22/7 * 7 * 7 * 30 = 4.620 cm'3

29. v. tabung = pi * r * r * t = 22/7 * 7 * 7 * 20 = 3.080 cm'3
v. balok = p * l * t = 20*18*8 = 2.880 cm'3
v. gabungan = 3.080+2.880 = 5.960 cm'3