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Question

Which one among following shapes is not a polygon?

A
triangle
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B
pentagon
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C
semi-circle
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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.

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