M∠1=58 and m∠2=122 what is m∠3

We know that the sum of all the three angles of any triangle equals 180 degrees

Now here measure of two angles is given to us and we are asked to fine the measure of third angle

So we can apply the property

So

m∠1 + m∠2 + m∠3 = 180°

58°+122° + m∠3=180°

180° + m∠3 = 180°

subtracting 180° from both sides

we get

m∠3 = 0°

It means the triangle is not possible, it will be a straight line