Interior angles of all triangles add up to 180 degrees.
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180 degrees
in a regular (equilateral) triangle, all angles are 60 degrees, to add up to 180
An equilateral triangle has 3 congruent angles that add up to 180 degrees.
An equilateral triangle has 3 equal inside angles that add up to 180 degrees.
The sum of the 3 exterior angles of an equilateral triangle add up 360 degrees