Answer:
y=60°
Step-by-step explanation:
y+60+60=180 degree (sum of interior angles of a triangle)
y+120=180
y=180-120
y=60 degree
Since AC=BC=AB
ABC TRIANGLE IS A EQUILATERAL TRIANGLE
Y+60+60 =180
Y =180-120
y = 60
so the answer is option D
