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BC = 12 cm
AB² + BC² = AC²
16² + 12² = AC²
256 + 144 = AC²
400 = AC²
√400 = √AC²
20 = AC
Ka = AB + BC + AC
= 16 cm + 12 cm + 20 cm
= 48 cm
La = 1/2 × a × t
= 1/2 × BC × AC
= 1/2 × 12 cm × 16 cm
= 12 cm × 8 cm
= 96 cm²
LP = 2(La) + (Ka × t)
1.392 = 2(96) + (48 × t)
1.392 = 192 + 48t
48t = 1.392 - 192
48t = 1.200
t = 25
V = La × t
= 96 cm² × 25 cm
= 2.400 cm³
Jadi volume prisma tersebut adalah 2.400 cm³