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= 48 × 25 = 1.200 cm²
L2 = a × t : 2
= 48 × 28 : 2 = 48 × 14 = 672 cm²
L gabungan = 1.200 + 672 = 1.872 cm²
seingat saya seperti itu. semoga membantu. maaf kalau salah