Answers

2014-02-06T20:49:25+05:30
The formula for the sum of angles is (n-2)*180 with n being the number of sides.
100+145*(n-1)=
(n-2)*180
100+145n-145=180*(n-2)
145n+(100-145)=180*(n-2)
145n-45=180n-360
360-45=35n
315=35n
9=n
The answer is: this polygon has 9 sides

1 5 1