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=1/2 × d1 × d2
=1/2 ×12 × 16
= 6 × 16
= 96 cm
sisi belah ketupat
s²=16² + 12²
s²=256 + 144
s²=400
s=√400
s=20 cm
keliling alas
= 4 × s
= 4 × 20
= 80 cm
Luas permukaan limas
= 2 × Luas alas + keliling alas × t
= 2 × 96 + 80 × 8
=192 + 640
=832 cm²