panjang: lebar=3:1 panjang=? lebar =? keliling =208

keliling = 2(p+l)
208 = 2 (3x + 1x)
208 = 2 x 4x
208 = 8x
x = 208 / 8
x = 26 

panjang = 3x
            = 3 x 26
            = 78

lebar = 1x
        = 26