Brazil dwarfs Democratic Republic of the Congo: about 8,499,400 km² km² against 2,334,703 km² km². At true size Brazil is about 3.6× larger — the whole of Democratic Republic of the Congo fits into Brazil roughly 3 times.
Brazil sits in South America, Democratic Republic of the Congo in Africa. On the old Mercator map the latitude gap distorted how large each felt beside the other; at true size the answer is simply 3.6×.
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.
Democratic Republic of the Congo fits 3× into Brazil.