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keliling = 70cm
keliling = 2(p+l)
70 = 2(4x + x)
70 = 2(5x)
70 = 10x
x = 7
panjang = 4x = 4(7) = 28cm
lebar = x = 7cm
luas = p . l
luas= 28 x 7
luas = 196