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kell = 2(p+l)
28 = 2(l+4+l)
28 = 2(2l+4)
28/2 = 2l+4
14 = 2l+4
14-4= 2l
10= 2l
5 = lebar
5+2 = panjang (7)
luas = p x l
= 5 x 7
= 35 cm^2
semogamembantu:)