St Michael of the Hypotenuse.
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An angle of 90 degrees is known as a right angle.
An angle that measures 180 degrees would be in a straight line. Therefore, this angle is known as a straight angle.
The COEFFICIENT of Refraction.
An upwards inclination of the wings on lateral axis and an included angle is known as dihedral angle.
An angle that is less than 90 degrees is known as an acute angle.