Africa dwarfs Tanzania: about 30,370,000 km² km² against 945,781 km² km². At true size Africa is about 32.1× larger — the whole of Tanzania fits into Africa roughly 32 times.
The old Mercator map treated both about equally (1× vs 1× inflation), so at least their relative sizes were preserved — even if both were drawn at the wrong absolute scale.
Tanzania fits 32× into Africa.