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lebar = 10
jawaban soal a
keliling = 2 (p + l)
76 = 2 (p + 10)
76 = 2p + 20
76 - 20= 2p
56 = 2p
56/2 = p
28 = p
maka panjang = 28
jawaban soal b
luas = p x l
= 28 x 10
= 280 cm ²