They are often used in geometry because they are. All angles in an equilateral triangle are 60 degrees. Equilateral triangles: Equilateral triangles have three equal sides and three equal angles. So all other quadrilaterals are irregular. This sheet presents different types of triangles based on sides (Equilateral, Isosceles, and Scalene) and angles (Right, Acute, and Obtuse). The only regular (all sides equal and all angles equal) quadrilateral is a square. and that's it for the special quadrilaterals.
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