Suppose triangle ABC is right isosceles. Vertex B is at (0, 0). Points A and C are at (0, 2a) and (2a, 0). X is the midpoint of AC. How can you tell that triangle AXB is isosceles?

Question

anonymous · Answer

A.  The length of segment AB = the length of segment 
      CB = a√2.
B.  The length of segment AB = the length of segment 
     CB = 2√a.
C.  The length of segment AX = the length of segment 
      XC = a√2.
D.	The length of segment AX = the length of segment 
        XC = 2√a.

anonymous · Answer

please help 
i dont know how to do this