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Providing that it is a regular 10 sided decagon then each interior angle is 144 degrees
A decagon is a 10 sided polygon. Exterior degrees total 360 Interior degrees total 1440
well the total degrees in a decagon is 1440 therefore each interior angle in a regular decagon would measure 144 degrese
The total number of degrees in any regular polygon is calculated by (S-2) * 180º, where S = the number of sides. So, for a decagon the total is 8 * 180º = 1440º, and the measure of each interior angle is 144º, or 1/10th of the total. The last bit is correct only if the decagon is regular. It need not be.
If it's a regular 10 sided decagon then each interior angle is 144 degrees which gives it a total sum of 1440 degrees