You only know that all ten interior angles of a 10-sided figure add up to 1,440 degrees.
IF the 10-sided figure happens to be REGULAR, then each of them is 144 degrees.
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It is 45
Decagon is 10 sided figure. Internal angles of 10 sided figure is (2 x 10 - 4) right angles = 16 x 90 degrees, hence one angle is (16 x 90)/10 = 16 x 9 = 144 degrees
Its interior angles are: (10-2)*180 = 1440 degrees If its a regular 10 sided polygon then each interior angle is: 1440/10 = 144 degrees
A 10 sided decagon has interior angles that add up to 1440 degrees
A regular 10 sided decagon has 10 interior angles that add up to 1440 degrees and each interior angle is 1440/10 = 144 degrees