The base is 5 because when you divide 31.5 by 6.3 it's 5
1g I think am not sure u didn't give a lot of information on this problem
Efdgbgfsgfbs6y54eytrarhtjgyhj
When naming triangles we name them by the letters on each corner so only answers with T, A, and X in them are correct, so TAX, XTA, and AXT