Regular and Irregular Polygons
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Regular polygon A polygon is regular, if all its sides have the same length and all its angles have the same measure.
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Irregular polygon A polygon is irregular, if it is not regular.
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The correct answer is
Remember :
The smallest number is the one that comes first while counting.
Solution :
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21,27,23
21 is the smallest number.