Which shape is the odd one out? circle, square, triangle, hexagon

Which shape is the odd one out? circle, square, triangle, hexagon

کون سی شکل دوسروں سے مختلف ہے؟ دائرہ، مربع، مثلث، مسدس
Explanation

A circle does not have a side and hence no vertex.

Hence, "circle" is different from all other given shapes.

 the square has 4 sides,

A hexagon has 6 sides,

triangle has 3 sides. 

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