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In Euclidean geometry, the sum of the angles Î± + Î² + Î³ is equal to two right angles (180Â° or Ï radians). This allows determination of the third angle of any triangle as soon as two angles are known. should IMHO be: In Euclidean geometry, the sum of the internal angles is a straight angle. This allows determining the amplitude of the third internal angle of any triangle once the amplitudes of the others are known. Similar confusions exist between segments and their lengths.
The angle or arc that when added to a given angle or arc equals a right angle in measure That is, for any angle x less than 90Âº, the complement of xÂº = (90 - x)Âº. For exa â¦ mple, the complement of 15Âº is (90 - 15 =) 75Âº.