no.30 tolong bantu pakai cara

Bangun Ruang

V kubus = r x r x r
= 30 x 30 x 30
= 27000 cm^3

V prisma segitiga = 1/2 x a x t x t prisma
= 1/2 x 30 x 30 x (50 - 30)
= 15 x 30 x 20
= 9000 cm^3

V gabungan = V kubus + V prisma
= 27000 + 9000
= 36000 cm^3 (C).

*semoga membantu. sukses selalu ^_^