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lebar = x + 6
keliling = 2(p+l)
100 = 2(3x+4+x+6)
100 = 2(3x+x+4+6)
100 = 2(4x + 10)
100 = 8x + 20
100 - 20 = 8x + 20 - 20
80 = 8x
x = 80/8 =10
panjang = 3x + 4 = ( 3 x 10) + 4 = 34 cm
lebar = x + 6 = 10 + 6 = 16 cm
ini perbaikan yg tadi..