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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.
Angle - An angle is a figure formed by two lines that intersect at a point. Right Angle - An angle that has an angle measure of 90Âº. Angle Congruence - Angle congruence means that two angles have the same angle measure in degrees. Supplementary Angles - Two angles are supplementary if their sum adds up to 180Âº.