Answer:
Step-by-step explanation:
It is assumed the three angles are interior angles of a triangle.
Given
We know the sum of interior angles of a triangle is 180°.
Use this property to find the missing angle measure:
- m∠1 + 39° + 85° = 180°
- m∠1 + 124° = 180°
- m∠1 = 180° - 124°
- m∠1 = 56°
