Verified Answer :

ayah1

A = (s - 2)180

A = (s)180 - (2)180

A = 180s - 360         (add 360 to each side)

A + 360 = 180s - 360 + 360

A + 360 = 180s        (divide 180 from each side)

(A + 360)/180 = s

s = 

AL2006


You said that                         A              = (s-2) 180

Divide each side by  180 :    A/180       = s-2

Add  2  to each side:            A/180 + 2 = s  

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