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A sum of 360°

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A full turn is 360°

Both add up to 360°120°95°80°65°around a point120 + 95 + 80 + 65 = 36085°85°85°?in a quadrilateral360 − 255 = 105°
Look for symmetry — it hands you an extra angle free.
  1. 1Angles that meet at a point add up to 360°.