Answer:
50°
Step-by-step explanation:
You're dealing with an isoceles triangle. The two red lines on the sides of the triangle mean that those two sides are the same length, hence, an isoceles triangle.
It's been a while, so I forgot the theorem name (you should look it up), but if two sides of a triangle are the same, then the angles are the same as well.
Because leg AB = CB, the angles are the same.
Hope this helps!
