Plane and solid shapes are related to each other. We can trace the flat faces of a solid shape to obtain a plane shape.
For example: Consider the solid shape given below.
The given solid shape is a cone. It has a circular base.
It can be traced to make a circle.
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The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.