Question

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

Answer 1

∠ABC= 70

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