Idon't understand how to solve this, if you can show work, you

Step-by-step explanation:

We know:

The sum of the measures of the angles of the triangle is equal to 180°.

Therefore we have the equation:

m∠1 + 57° + 43° = 180°

m∠1 + 100° = 180°         subtract 100° from both sides

m∠1 = 80°

The angles ∠1 and ∠2 are the vertex angles, therefore they are congruent.

m∠2 = 80°.

Second equation:

x° + x° + 80° = 180°           subtract 80° from both sides

2x° = 100°       divide both sides by 2

x° = 50°

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