help me with 1984 assigment

Take a look at the three Ingsoc mantras: war is peace, freedom is slavery, and ignorance is strength. The first two are natural opposites (at least last time we checked). But what about that last one? Orwell seems to be saying that ignorance is the opposite of strength. Why not say “weakness is strength?” Does 1984 make a successful argument for ignorance being the same thing as weakness?