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If two angles in a triangle are 55° and 65°, what is the third?

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  1. 60°
  2. 50°
  3. 70°

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References

  1. OpenStax Prealgebra 2e, Use Properties of Angles, Triangles, and the Pythagorean Theorem openstax.org/books/prealgebra-2e/pages/9-3-use-properties-of-angles-triangles-and-the-pythagorean-theorem Checked 2026-10-12.

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