Answer:
[tex]a=49[/tex]
Step-by-step explanation:
The angle having value [tex](a+49)\textdegree[/tex] is the exterior angle.
Exterior angle of a triangle is equal to the sum of the other two opposite angles.
Hence
[tex]a+49=a+a\\\\a+49=2a\\\\2a=a+49\\\\2a-a=49\\\\a=49[/tex]
