Approximately 179.64°, or (499 Pi) / 500 radians.
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It is: 40 degrees and 90 degrees respectively
A regular trapezoid (!) is a square. And each interior angle of a square is 90 degrees.
Each exterior angle of a regular octagon measures 45 degrees
Providing that it's a regular decagon then each exterior angle will measure 36 degrees
60 degrees.