Answer:
C
Explanation:
The sum of the exterior angles of a polygon = 360°
The exterior angle adjacent to 93° = 180° - 93° = 87°
Sum the exterior angles and equate to 360
78 + x + 52 + 87 + x + 3 = 360 ← simplify left side
2x + 220 = 360 ( subtract 220 from both sides )
2x = 140 ( divide both sides by 2 )
x = 70 → C