Some useful relations:
Diameter = 2 × radius
Circumference = 2 × π × radius
Also, circumference = π × diameter
Let's consider an example to look at the use of these relations.
Assume that the radius of a circle is 21 cm. Let's find the circumference of the circle.
Circumference = 2 × π × radius
= 2 × 3 × 21 [Using 3 as an estimated value for π]
= 6 × 21
= 126
So, the circumference of the circle is about 126 cm.
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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.
21,27,23
21 is the smallest number.