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Jawab:
Penjelasan dengan langkah-langkah:
1. Lp = 2Ls + 2Lk + La
Ls = 1/2 × a × t = 1/2 × 6 × 4 = 12
Lk = 15 × 5 = 75
La = 15 × 6 = 90
Lp = 2(12) + 2(75) + 90 = 24 + 150 + 90 = 264cm²
2. Lp = Ls + 2La
Ls = Ka × t = (5 + 5 + 7 + 13) × 10 = 30 × 10 = 300
La = (7 + 13)/2 × 4 = 20/2 × 4 = 40
Lp = 300 + 2(40) = 380 cm²
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