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L = 3 (p×l)
= 3 ( 28 × 14 )
= 3 ×392
= 1176 cm²
menuurut saya seperti itu, walaupun di pilihan gandanya gx ada..
mungkin aja pilihan gandanya yg salah. atau jawaban saya yg salah
kalo salah mohon maaf ea,,,,,