Total 1440o; if regular, each angle = 144o
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360 degrees
Each interior angle of a regular 10 sided decagon measures 144 degrees
It is 45
The measure of each interior angle of a dodecagon, which is a 12 sided regular polygon, is 150o. This is found in any polygon by multiplying 2 less than the number of sides by 180o and then dividing the product by the number of sides. A dodecagon interior angle is then 10 x 180o/12 = 150o.
It can have any value at all. A definite value can be determined if the polygon is regular, but there is no justification for assuming that to be the case.