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Sticky Note
If two angles of a triangle are 50° and 40°, the third angle is?
  1. 80°
  2. 90°
  3. 100°
  4. 110°
Explanation

The sum of all angles in a triangle is 180°, so the remaining angle must be 90°.


We use the triangle angle rule

A+B+C=180∘

50∘+40∘=90∘

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