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5, 12, 13 (phitagoras)
129 = 2×(keliling alas) + 3t
129 = 2×(5+12+13) + 3t
129 = 2×30 + 3t
129 = 60 +3t
129 - 60 = 3t
69 = 3t
3t = 69
t = 69 ÷3
t = 23
6.
Cari sisi belah ketupat
16 ÷ 2 = 8
12 ÷ 2 = 6
phitagoras
3, 4, 5
↓ ↓ ↓ ×2
6, 8, 10
jadi sisi belah ketupat = 10 cm
keliling belah ketupat = 10 × 4 = 40cm
tinggi prisma = 24 cm
panjang kerangka prisma = 2×(kel alas) + 4 t
2 × 40 + 4 × 24 = 80 +96 = 176cm