Jawabanmu

2014-06-01T21:52:32+07:00
2014-06-01T22:15:08+07:00
L.alas = L.segitiga

L.alas = 1/2 × a × t
= 1/2 × (20×29) ×21
= 290 × 21 = 6090

V.prisma = L.alas × Tinggi
= 6090 × 30 = 182700 cm^3