In triangle ABC, if angle a + angle B = 2 angle c, angle a-angle C = 40 °, what triangle is it?

In triangle ABC, if angle a + angle B = 2 angle c, angle a-angle C = 40 °, what triangle is it?

∠A+∠B=2∠C=180°-∠C
Therefore, C = 60 degree
∠A-∠C=40°
Therefore, a = 100 ° and B = 20 °
So it's an obtuse triangle
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