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Angles on a line and around a point

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Learn it Angles on a straight line add to 180°. Angles around a point add to 360°. When two lines cross, opposite angles are equal.

Example: Two lines cross and one angle is 65°. Find the other three.

  1. The opposite angle is also 65°.
  2. The angles next to it: $180 - 65 = 115°$ each.
  3. Check: $65 + 115 + 65 + 115 = 360°$ ✓.

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