Answer:
∠a = 105°
Step-by-step explanation:
If a set of 2 parallel lines, line f and line g, are intersected by another line n, then at each of the parallel lines, then at each of the parallel lines adjacent angles are supplementary (i.e their sum is equal to 180° as shown in fig 1
Following this rule, comparing fig 2 with fig 1
[tex]\implies a = 180 -75\\\implies a =105[/tex]
If f and g are parallel then ∠a must be equal to ∠d
[tex]\implies \angle a = \angle d =105^{o}[/tex]
