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What is the angle sum of a triangle?

  1. 180 degrees

  2. 90 degrees

  3. 360 degrees

  4. Cannot be determined

The correct answer is: 180 degrees

A triangle is made up of three angles, and in a flat plane, the sum of those angles is always 180 degrees. Options B and C are incorrect because they are either too small or too large to be the sum of the triangle's angles. Option D is incorrect because the angle sum of a triangle can always be determined using the formula 180 - (interior angle 1 + interior angle 2). Therefore, the correct answer is A 180 degrees.