A^2+b^2=c^2
20^2+b^2=29^2
400+b^2=841
-400. -400
 b^2=√441
b=21
        
             
        
        
        
Answer:
don't get what
Step-by-step explanation:
..................
 
        
                    
             
        
        
        
Okay so this is a wild guess but I would say 12. The whole angle is 90, but only 1/3 of that is in the smaller portion of the triangle. So, I assumed that 1/3 of the length of the whole triangle. Three times 6 is 18 and minus AD is 12. So BD=12? This is my best guess hope it helps
        
             
        
        
        
one hundred and forty four point one four four.