Answer:
The shape of polygon is Nonagon.
Explanation:
We need to find name of polygon whose number of vertex is one more than an octagon.
The number of vertex of octagon is 8 because total 8 side of octagon.
The number of vertex of required polygon is 1 more than 8
Thus, The number of vertex of required polygon is 8+1 = 9
The number of side of polygon is 2 fewer than a hendecagon.
The side of hendecagon = 11
The number of side of required polygon is 2 fewer than 11
Thus, The number of side of required polygon is 11-2 = 9
The number of side required polygon is 9 and number of vertex of polygon is 9.
Thus, It must be Nonagon because Nonagon has 9 sides and 9 vertex.