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p = 1,5l
K = 35 cm
Maka,
K = 2p + 2l
35 =2(1,5l) + 2l
35 = 3l + 2l
35 = 5l
l = 35/5
l = 7 cm
Masukkan l
p = 1,5l
p = 1,5(7)
p = 10,5 cm
Jadi, panjangnya = 10,5 cm dan lebar = 7 cm
Luas = p x l
Luas = 10,5 x 7
Luas = 73,5 cm²
Jadi, Luasnya = 73,5 cm²