Question

What is m∠1? 1 39° 85° m∠1 = °

Answer 1

• 56°

Explanation:

It is assumed the three angles are interior angles of a triangle.

Given

• ∠1, 39°, 85°

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°