tolong dijawab ya .. no 21

V balok = p.l.t
= 8.6.4
=192
Utk mencari tinggi prisma, dicari dulu panjang diagonal alasnya lalu dibagi 2

Diagonal prisma = √8²+6² = √100 = 10 >> 10:2=5
t prisma = √13²-5² = √144=12
v prisma = L alas.t
= 8.6.12 = 576
v total = 192 + 576 = 768