hello help me with this question thanks in advance

Answer:
AD=25cm
Step-by-step explanation:
BC//AD
XY is also parallel to BC and AD as it bisects BA and CD.
BX=XA, CY=CD
so tge decreasing in length BC to XY is the same with XY to AD
29-27=2
27-2=25
That is why AD= 25cm