Okay so here are my formula's:

#of Sides = n(n-3)/2

# of Diagonals = n(n-3)/2

Sum of measures of interior angles = 180(n-2)

Sum of measures of Individual Interior Angles = 180(n-2)/n

Sum of measures of Exterior Angles = 360/n

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Now my teacher gave us a table where in you need to answer these. I managed to answer all except for two. And I think the given numbers are wrong thats why I couldnt answer it. Because whatever answer I get it doesnt connect with the others. Anyway Ill show you the two.

#ofsides #Of Diagonals NOIA NOIIA NOEA

(Answer) 20 (Answer) 140 20

(Answer) (Answer) 4500 170 50

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When I check my answers it doesnt connect or come out right with the given numbers. So is the given wrong? Or is there a way to solve them?