tolong jwab y teman! pakai jalannya sklian☺

11.]
Dik:d=20 cm, r=10 cm
t=30 cm

dit:V

Jwb:V=πr²t
V=3,14 x 10² x 30
V=314 x 30
V=9420 cm³

12.]
Dik: r=7 cm, d=14 cm
t=2d=28 cm

Dit : V

Jwb:V=πr²t
V=22/7 x 7² x 28
V=154 x 28
V=4312 cm³

Semoga membantu

1. r = 20 : 2 = 10
V = L.alas × tinggi
= (3,14 × 10 × 10) × 30
= 314 × 30
= 9.420 cm^3

2. tinggi tabung = d×2=(7×2)×2=14×2=2 8
V = L.alas × tinggi
=(22/7×7×7) × 28
=(22/7×49) × 28
=(22 × 7) × 28
= 154 × 28
= 4.312 cm^3