60 degrees for an equilateral triangle but it depends on other types! Other angle measure could be 30, 45, or 90 degrees as well.
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60 degrees and it is an equilateral triangle.
60
44
63 degrees because 180 -39 -78 = 63
If the 58°-angle is one of the base angles, then the vertex angle is 64°.If the 58°-angle is the vertex angle, then the vertex angle is 58°.