The greek letter theta is usually used to denote an unknown angle. An angle of 90 degrees is a right angle, an angle between 0-90 degrees is an acute angle, bigger than 90 degrees but less than 180 is an obtuse angle, and bigger than 180 but less than 360 is a reflex angle.
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It is an angle measuring 30 degrees. But such an angle does not have a specific name.
From its right angle. right angle --> rect angle.
complete angle
A right angle
Corresponding Angle