give step wise answer plz
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sum of triangle=3=180
sum of quadrilateral=3+1=4=180+180=360
sum of dedagon=360+180+180+180+180+180+180+180+180=1800
sum of quadrilateral=3+1=4=180+180=360
sum of dedagon=360+180+180+180+180+180+180+180+180=1800
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