Problem: If the sum of all the angles except one of a convex polygon is , then the number of sides of the polygon must be
Answer Choices:
A.
B.
C.
D.
E.
Solution:
Let denote the samber sides (angles) of the given convex polygon and the number of degreas in the excepted angle. Then 180(n-2) so that
and incidentally the excepted angle .