Interior angles add up to 1440 degrees
Exterior angles add up to 360 degrees
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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.
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
A 10 sided decagon polygon has 10 interior angles that add up to 1440 degrees.
A decagon
144 of them.