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A radian is an arc of a circle whose size is the same as its radius and in degrees it is about 57.3 degrees because there are 360 degrees around a circle and so 2*pi radians = 360 degrees. 2 pi = 360 degrees therefore 18 degrees = 2 pi x 18/360 radians = 0.1 pi radians
A complementary angle adds to 90 degrees or pi/2 radians. A supplementary angle adds to 180 degrees or pi radians.
That's a unit of angular measurements. 2 x pi = one full circle. If you want to convert radians to degrees, you multiply by (180 / pi).
It is 90 degrees or pi/2 radians.
On the basis that you are familiar with terms such as "tetrakaidecagon" I assume you are mathematically at a stage where angles are measured in radians and not degrees. Then the interior angles of a 14 sided polygon sum to (14-2)*pi radians or 12*pi radians.