The internal angles add to 180 degrees.
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The sum of the angles in any triangle is 180 degrees.
The sum of the three angles of any triangle is 180o.
The sum of the angles in ANY triangle (equiangular or not) is 180 degrees.
The sum of the 3 angles in any triangle including a scalene triangle add up to 180 degrees.
The sum of the angles inside a triangle is 180 degrees.