In \(x = y\) and \(a=b\). Prove that \(f || h\).  
 
30-AR4-LA - Copy.png
 
Proof:
 
Now, \(x = y\) (Given)
 
Therefore, \(f||g\) (
) ----(1)
 
 Also given that \(a = b\).
 
Therefore, \(h|| g\) (
) -----(2)
 
From (1) and (2), \(f || h\) (Lines parallel to the same line)
Answer variants:
Alternate angles
Corresponding angles