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= 3,14 × 5 × 5 × 12
= 942 cm³
cara mencari sisi persegi, melalui rumus segitiga siku-siku istimewa yaitu
45° : 45° : 90°
1 : 1 : √2
6√2 : 6√2 : 12
sisi persegi = 6√2 cm
V prisma = La × t
= 6√2 × 6√2 × 12
= 36 √4 × 12
= 864 cm³
Volume ruangan di luar prisma = 942 - 864 = 72 cm³