Algeria dwarfs Brazil: about 2,322,788 km² km² against 8,499,400 km² km². At true size Algeria is about 3.7× larger — the whole of Brazil fits into Algeria roughly 3 times.
Algeria sits in Africa, Brazil in South America. On the old Mercator map the latitude gap distorted how large each felt beside the other; at true size the answer is simply 3.7×.
The old Mercator map treated both about equally (1.3× vs 1× inflation), so at least their relative sizes were preserved — even if both were drawn at the wrong absolute scale.
Algeria fits 3× into Brazil.