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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.
Right angle: When the angle measure exactly 90o, then the angle is called a right angle or we call that the two arms are perpendicular to one another.4. Obtuse angle: When the measure of the angle is more than 90o and less than 180o, then the angle is called an obtuse angle. Example: 91o, 100o, 179o 5.Straight angle: When the angle measure exactly 180o, then the angle is called a straight angle. 6.btuse angle: When the measure of the angle is more than 90o and less than 180o, then the angle is called an obtuse angle. Example: 91o, 100o, 179o 5. Straight angle: When the angle measure exactly 180o, then the angle is called a straight angle. 6.