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A regular quadrilateral is a square and each angle is 90 degrees (i.e. a right angle).
An equilateral triangle has 3 equal sides and 3 equal interior angles each measuring 60 degrees
Each interior angle in an equilateral triangle measures 60 degrees and the three angles add up to 180 degrees
Acute angle in the range (0, pi/2) radians = (0, 90) degrees.Right angle = pi/2 radians = 90 degrees.Obtuse angle in the range (pi/2, pi) radians = (90, 180) degrees.Straight angle = pi radians = 180 degrees.Reflex angle in the range (pi, 2*pi) radians = (180, 360) degrees.Full turn = 2*pi radians = 360 degrees.
At each vertex of a triangle, an exterior angle of the triangle may be formed by extending ONE SIDE of the triangle.