kak kak tolong dijawab

28) V = L alas × Tinggi Prisma
= 1/2 20 × 15 × 30
= 10 ×15. × 30
= 150. × 30
= C. 4500

29) V = L alas. × T Tabung
= 22/7 × 10.5× 10.5 × 28
= 22/7 × 110.25 × 28
= 346.5. ×28
= D. 9.702 Cm Kubik