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Verified answer
Luas permukaan prismaluas alas×2+luas selimut samping
lalas=
40×2=80
luas selimut=
5×12×2=120
8×12×2=192
-------------------+
312
luaspermukaas=312+80=392
luas permukaan prisma 2
luas alas ×2+luas selimut
luas alas×2
9×12÷2×2=108
luas selimut
30×12=360
30×9=270
30×15=450
-----------------+
1080
luas permukaan
1080+108=1188