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280 = 2( 1 ⅓ l) + 2 l
280 = 2 ( 4/3 l) + 2 l
280 = 8/3 × 2l + 2l
280 × 3/8 = 4l
105 = 4l
l = 105/4 = 26,25
sekarang kita cari panjangnya
panjang = 1 ⅓ lebar
panjang = 105/4 × 4/3 = 35
sekarang cari luasnya
35 × 26,25 = 918,75 cm²
semoga membantu ^^