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5.) L = 12 × 5 = 60 cm²
6.) K = 10 + 10 + 12 = 32 cm
7.) L = 12 × 8 ÷ 2 = 48 cm²
8.) Biaya = K × Harga
= 2×(35+20) × 250000
= 110m × 250000
= Rp. 27500000
9.) Biaya = L × Harga
= 35 × 20 × 50000
= 700m² × 50000
= Rp.35000000
10.) K = 1/4 × 2 × 22/7 × 10 = 15,7 cm
L = 1/4 × 22/7 × 10² = 78,5 cm²