It will be the median angle, and the side opposite it will be of median length. The other two angles must sum to 120 degrees. Probably little else that can be said.
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A right angle triangle
It is a right angle triangle because the 3rd angle has to be 90 degrees
It is a right angle triangle
An equilateral triangle has 3 interior 60 degree angles but a right angle triangle can have 3 interior angles of 90, 60 and 30 degrees
Each angle is 60 degrees