1)S=180(4-2)=180*2=360
2)S=180(12-2)=180*10=1800
3)S=180(30-2)=180*28=5040
4)S=180(50-2)=180*48=8640
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1)S=180(4-2)=180*2=360
2)S=180(12-2)=180*10=1800
3)S=180(30-2)=180*28=5040
4)S=180(50-2)=180*48=8640