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What is the sum of the angles of a triangle?

  1. 180°

  2. 120°

  3. 330°

  4. 360°

The correct answer is: 180°

A triangle has three angles, and the sum of those three angles is always 180°. This is a fundamental property of triangles and is known as the Angle Sum Theorem. Option B is incorrect because it is a lesser value than the sum of the angles of a triangle. Options C and D are also incorrect because they are greater values than the sum of the angles of a triangle, and triangles cannot have angles greater than 180°. Therefore, the correct answer is 180°.