<PRE><B>Question 831454</B>
An octagon has 8 sides
We have the formula to find the measures of each interior angle of any polygon:
(s-2)*180 over s in which s represents the number of sides 
Octagon has 8 sides, so s will be 8, so you have
(8-2)*180 over 8
6*180 over 8
1080 over 8 
= 135
TA-DAH
Each interior angle of a regular octagon has the measure of 135 degree :D </PRE>