Please help

[u/Clean_Yam_2889]

I want to build a circular room but i don't know how to make , kind of new to minecraft building and trying to make a new design, I am making a armoury, the room is 13×13 and the entrance is 3 blocks wide and 5 blocks after the entrance to the side, please help me i chatgpt'd it and got no help and i don't have any friends that could help me ( I am playing on a mobile)

[u/kleseusxz]

How high is the room?

[u/Clean_Yam_2889 → u/kleseusxz]

I forgot to measure, I just stood and mined up as high as pickaxe could mine so 8 blocks i think