A square brass plate, 8.00 cm on a side, has a hole cut into its center of

Question:

A square brass plate, 8.00 cm on a side, has a hole cut into its center of area 4.90874 cm2 (at 20.0 °C). The hole in the plate is to slide over a cylindrical steel shaft of cross-sectional area 4.91000 cm2 (also at 20.0 °C). To what temperature must the brass plate be heated so that it can just slide over the steel cylinder (which remains at 20.0 ° C)?