The 3 interior angles of 60 degrees add up to 180 degrees
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The sum of the 3 exterior angles of an equilateral triangle add up 360 degrees
in a regular (equilateral) triangle, all angles are 60 degrees, to add up to 180
Because the total sum of angles in any triangle adds up to 180 degrees.
Triangle? Well, an equilateral triangle is equiangular meaning all angles are equal. The angles are 60 degrees which sum up too 180 degrees. :-)
An Equilateral Triangle has three congruent sides.All three sides of this triangle are of the same length hence have same angles which sum up to 180 degrees.