Answer:
B.57
Step-by-step explanation:
exterior angle is equal to the sum of opposite interior angle.
2y = 114
y = 114/2
y = 57
B. 57°
180° in a triangle
180° in a straight line
180 - 114 = 66
66 + y + y = 180°
66 + 2y = 180°
-66 -66
---- ----
2 2
y = 57°
