Answer:
139°
Explanation:
In a triangle all angles add up to 180°.
77+62+x=180
77+62=139
180-139=41.
∠ C =41°
It says the triangles are similar so when you line up the angles,
∠ C is similar to ∠ F.
Which means ∠F=41° as well.
A straight line is 180°, so you just subtract 180 from 41 and you get 139° for angle ∠1
180-41=∠1
139=∠1