tolong ya pakai caranya......

a. V = 1/3 x L.alas x t
V = 1/3 x (12x12) x 8
V = 1/3 x 144 x 8
V = 384 cm^3

b. Luas permukaan = L.alas + 4. Luas BCT
Luas BCT = 1/2 x BC x TO
cari dulu nilai TO,
misal tengah2 BC = O
maka TO = √6^2 + 8^2 = √36+64 = √100 = 10

Luas Segitiga BCT = 1/2 x 12 x 10 = 60
Luas permukaan = (12x12) + 60 = 144 + 60 = 204 cm^2