An exterior angle of a decagon can have any value in the range (0, 360) degrees - excluding 180 degrees. The only constraint is that the sum of all exterior angles must be 360 degrees.
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You cannot. An exterior angle of a decagon can have any value.
Usually, the measure of an exterior angle of a pentagon is greater.
Each exterior angle of a regular polygon with n sides is 360/n degrees. So, for a decagon, it would be 360/10 = 36 degrees.
The exterior angles of any polygon add up to 360 degrees including a 10 sided regular decagon of which each exterior angle will measure 360/10 = 36 degrees.
It is a regular 10 sided decagon