The Temple Institute: In-Depth Temple Study: The Gate of the Firstborn
 
The Gate of the Firstborn: Dimensions

All the gates of the Temple were 20 cubits * high and ten cubits wide, and their doors were overlaid in gold. (Source: Midot 2:3). 

Contents:   Part I,    Part II,    Part III,    Part IV,    Part V,    Part VI,    Part VII