A circle is a closed curve that is made of points that are the same distance from the center.
A radius of a circle is a line segment that connects the center to a point on the circle.
A chord is a line segment that connects two points on the circle.
A diameter of a circle is a line segment that passes through the centre of the circle, connecting two points on the circle.
An arc is a curved part of the circle.
The circumference of a circle is the distance around the outside of the 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.