The Angle Sum Secret: Quickly find missing angles!

Tired of adding angles? Want to find missing angles in a triangle super fast? This trick is for you!

Subject: geometry • Classes: 6–12 • Difficulty: basic (6-8)

The Trick

The angles inside any triangle ALWAYS add up to 180 degrees! This is a fundamental property. So, if you know two angles, you can easily find the third. Just add the two known angles together, then subtract the result from 180. Let the known angles be $a$ and $b$, then the missing angle $c = 180 - (a + b)$. This works because the sum of all angles is constant.

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