Answer:
66
Explanation:
1. The exterior angle theorem states that the measure of an exterior angle of a triangle is congruent to the sum of the two opposite interior angles.
- Basically, exterior angle = opposite interior angle + opposite interior angle
2. Now, let's see what information we have so far, and what we don't have.
- m∠4 is 124 degrees, is the exterior angle
- The angle with 58 degrees is one of the opposite interior angles
- ∠2 is the other opposite interior angle, but we don't know its measure
3. Now, let's set up the equation and solve it.
Step 1: Set up the equation.
Step 2: Subtract 58 from both sides.
Step 3: Check if solution is correct.
Therefore, the answer is 66.