Jawab:
Volume = 2112 cm³ ✅
Luas permukaan = 960 cm² ✅

Penjelasan dengan langkah-langkah:

Diketahui:
sisi alas (r) = 12 cm ✔
tinggi limas (a) = 8 cm ✔

Setengah sisi alas (b) =
r÷2 = 12÷2 = 6
b = 6 cm ✔

Cari c (tinggi sisi segitiga)
c² = a² + b²
c² = 8² + 6²
c² = 64 + 36
c² = 100
c = √100
c = 10 cm ✔

Dicari: Volume
Volume = kubus + limas
Volume = r³ + (r² × a÷3)
maka
Volume = r² × (r + (a÷3))
Volume = 12² × (12 + (8÷3))
Volume = 144 × (12+2+⅔)
Volume = 144 × 14+⅔
Volume = 144 × ⁽¹⁴⁽³⁾⁾⁺⅔
Volume = 144 × ⁴²⁺⅔
Volume = 144 × ⁴⁴/₃
Volume = 48 × 44
Volume = 2112 cm³ ✅

Dicari: Luas permukaan
Luas =
slimut kubus + slimut limas =
(5×r²) + (4×(b×c)) =
(5×12²) + (4×(6×10)) =
(5×144) + (4×60) =
720 + 240 =
Luas permukaan = 960 cm² ✅

<(7o7)>