is you mean the measure of each degree in a regular polygon: you just take the number of sides and subtract 2 then multiply by 180 and divide by the number of sides to get each angle i.e. 180(s-2)/s so since a pentagon has 5 sides 5-2=3---.>3(180)=540 and 540/5=108 so the degree measure of any side in a pentagon (regular) is 108