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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.
Well all for sided figures are known as quadrilaterals and if a quadrilateral has 4 right angles, it would either be a square or rectangle. A square is a quadrilateral that has 4 right angles and 4 equal sides. A rectangle, however, is a quadrilateral that has 4 right angles with two sets of parallel lines! 2k Views Â· View Upvoters