How to Calculate the Third Angle of a Triangle Using a Simple Formula

Learn the formula to find the third angle of a triangle using angles A and B with our easy explanation.

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The formula for the third angle of a triangle is straightforward. Given the angles A and B, the third angle C can be found using: C = 180° - (A + B). This is because the sum of all angles in a triangle is always 180 degrees.

FAQs & Answers

  1. What is the sum of the interior angles of a triangle? The sum of the interior angles of any triangle is always 180 degrees.
  2. How do you find the third angle if two angles of a triangle are known? Subtract the sum of the two known angles from 180°. The result is the measure of the third angle.
  3. Can the third angle of a triangle be calculated if only one angle is known? No, you need at least two angles to find the third angle using this formula.

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