jawab dungs kakbang please

tinggi limas = √15²-9² = √225-81 = √144 = 12 cm

panjang sisi alas = 1/2 × diagonal√2
= 1/2 × 18√2
= 9√2 cm

volume = 1/3 × luas alas × tinggi
= 1/3 × (9√2×9√2) × 12
= 1/3 × 162 × 12
= 1.944/3
= 648 cm³