help? this is exterior angle theorem how do i find it?

Answer:
m<3=65 degrees
Step-by-step explanation:
Since the exterior angle theorem is says:
The measure of an exterior angle of a triangle is the sum of two remote angles in a triangle so,
43+22= m<3
So m<3= 65
65°
Step-by-step explanation:
the 2 separate angles when added together will equal the 3 exterior angle because the 3 angles of the triangle should equal 180 and the horizontal line is also equal to 180. therefore 43 plus 22 is equal to 65