Providing that it is a regular 16-gon:-
First draw lines from each corner of the 16-gon to the centre. This forms 16 equal angles at the centre - something like a circular cake which has been divided into 16 equal portions. You find the angle value by dividing the full circle of 360 degrees by 16 = 22.5 degrees
Besides 22.5 degrees being "the angle at the centre" of the figure (usually called a "polygon") this value is also the value of the "exterior" angle
You find the "interior" angle by subtracting the "angle at the centre" from 180 degrees, because 180 degrees (which is the total of the three angles in each of the 16 triangles). This is 180 degrees minus 22.5 degrees = 157.5 degrees.
Each interior angle: 157.5 degrees
Exterior angle+interior angle=180 degrees and 180-exterior angle=interior angle
It is: 180-interior angle = exterior angle
Interior angle 177.12 degrees Exterior angle 2.88 degrees
180 minus interior angle = exterior angle
180 minus interior angle = exterior angle
Exterior angle+interior angle=180 degrees and 180-exterior angle=interior angle
the interior angle is about 128.571428 the exterior angle is about 51.4285
It is: 180-interior angle = exterior angle
It is: 180-interior angle = exterior angle
With a protractor or if you know the exterior angle then it's 180 - exterior angle = interior angle
Interior angle 177.12 degrees Exterior angle 2.88 degrees
180 - interior angle = exterior angle
180 minus interior angle = exterior angle
180 minus interior angle = exterior angle
It is: 180-interior angle = exterior angle
180-interior angle = exterior angle
Exterior angle 40 degrees Interior angle 140 degrees