my teacher gave the answer but I have to figure out how she got the answer please help.

Answer:
what i did was 360 and how i got that was a circle equals 360 so 360-108=252 so 360-252=108
Step-by-step explanation:
Answer:
∠ABC= 70
Step-by-step explanation:
arc AB = 110, so ∠ACB = 55,
ΔABC is an isosceles triangle cause two sides are the same,
so ∠BAC = 55, angles in a triangle adds up to 180, so
180 - 55 - 55 = 70 = ∠ABC