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panjang 1 sisi = 68/4 = 17 cm
anggap itu diagonal 1 yg panjangnya 16 cm. baru kalau mau cari panjang d2 harus dibagi 2 dulu.
16/2 = 8 cm.
d2²=17²-8²
d2²=289-64³
d2²=225
d2=15cm
d2 yg kita dapat baru 1/2 d2 sesungguhnya jadi 15 x 2 = 30
volume prisma = luas alas x tinggi
= ³