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Question
Which one among following shapes is not a polygon?
Which one among following shapes is not a polygon?
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Solution
The correct option is C semi-circle
A figure is considered polygon if it fits into following properties:
1) Closed and two dimensional(planar)
2) made of straight sides
3) Only one inside area and only one outside area.
Triangle and Pentagon follow above all properties of a polygon.
Semicircle has curved shape on its boundary. 
As semicircle don't follow one of the properties of polygon, it is not considered a polygon.
A figure is considered polygon if it fits into following properties:
1) Closed and two dimensional(planar)
2) made of straight sides
3) Only one inside area and only one outside area.
Triangle and Pentagon follow above all properties of a polygon.
Semicircle has curved shape on its boundary.
As semicircle don't follow one of the properties of polygon, it is not considered a polygon.
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