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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.
A straight angle, as the name suggests, is an angle which resembles a straight line. An angle that measures 180$^{\circ}$ is known as a straight angle. This angle is also termed as half angle. Straight angle is equal to sum of two right angles.In other words, a straight angle is absolutely straight.It measures exactly 180$^{\circ}$. This type of angle is formed with the two rays pointing in the opposite directions. straight angle, as the name suggests, is an angle which resembles a straight line. An angle that measures 180$^{\circ}$ is known as a straight angle. This angle is also termed as half angle. Straight angle is equal to sum of two right angles.