Providing that it's a regular decagon then each exterior angle will measure 36 degrees
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Each exterior angle measures 36 degrees and the 10 exterior angles add up to 360 degrees.
216.
A ten-sided polygon. The sum of the angles of a decagon is 1440°. so 1440°÷10=144° ---------------------------------------------------------------------------- The easiest way to calculate this is to calculate the exterior angle and use the fact that the exterior and interior angles are supplementary. Sum exterior angles = 360° → Each exterior angle of a regular decagon is 360° ÷ 10 → Each interior angle of a regular decagon = 180° - 360° ÷ 10 = 144°
Each of the INTERIOR angles are 36 degrees - therefore each exterior angle is 360 degrees minus 36 which is 324.
Providing that it is a regular 10 sided decagon then each interior angle will measure 144 degrees