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L = L persegi ABCF + L segitiga DEC
= (80 x 30) + (30 x 40 : 2)
= 2400 + 600
= 3000 cm²
= 30 dm²
Tp itu menurutku, soalnya nggak terlalu jelas yg diketahui apa aja. Jadi, yg diatas itu nggak tau bener atau salah. Maaf ^^