144.
That is the correct answer for a decagon, but only if it is regular.
However, the WA browser does funny things with some symbols and if the question concerned dodecagons, then the answer is 150 degrees. Again, this is only true if the figure is reqular.
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Each interior angle measures 144 degrees
Each interior angle of a regular decagon would measure 144 degrees,
The angle measure for each interior is 144 degrees each.Explanation: The angle measure of each interior angle of a regular decagon is 144°. Since a decagon is a 10-sided figure, replace n by 10 in (n − 2) • 180°. So the sum of the interior angle measures in a decagon is (10 − 2) • 180°, or 8 • 180° = 1440°. This is a regular decagon, so all ten interior angles are congruent. To calculate the measure of each interior angle in this regular decagon, divide 1440 by 10. The answer is 144°. 144 degrees is equal to 4/5 of 180 degrees
Exterior Angle for a decagon is 36 Degrees.
A decagon has 10 sides, and the whole polygon has 360 degrees, so each angle is 36 degrees.