(n-2)*180/n
1) (6-2)*180=4*180=720/6=120
2) (10-2)*180=1440/10=144
3) (12-2)*180=1800/12=150
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(n-2)*180/n
1) (6-2)*180=4*180=720/6=120
2) (10-2)*180=1440/10=144
3) (12-2)*180=1800/12=150