Tolong bantu saya Kerjakan nomor 9 dan 10 Beserta Cara , Kalau bisa Cara di foto biar jelas. Makasih Kawan

9.)
r = 6
Luas selimut tabung = 400
2 πrt = 400
πrt = 400/2
πrt = 200

Jadi, volume tabung =
π r² t = π r r t = πrt r = 200(6) = 1200 cm² (D)

10.)
Volume kerucut = 176
(1/3) π r² t = 176
(1/3) (22/7) (r²) (10,5) = 176
(0,5) r² = 176/22
(0,5) r² = 8
r² = 8/0,5
r² = 16
r = √16
r = 4

Jadi, diameter alas kerucut = d = 2r = 2(4) = 8 cm (C)