144 degrees.
from the triangle (180 degrees) to find the degrees of shapes with one more side, add 180 degrees.
e.g. triangle (3 sides) - 180 degrees
quadrilateral (4 sides) - 180 + 180 = 360 degrees
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Interior angle: 144 degrees
Each interior angle of a regular 10 sided decagon measures 144 degrees
Providing that it is a regular 10 sided decagon then each interior angle is 144 degrees
An exterior angle of a regular polygon with n sides is 360/n degrees. So in the case of a decagon that would be 36 degrees. The interior angle is its supplement so 180 - 36 = 144 degrees. Furthermore, a non-regular decagon could have an interior angle with any value in the range (0, 360) degrees. The only constraint is that the sum of all ten interior angles is 1440 degrees.
Each interior angle measures 144 degrees