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Calculate Radius, Diameter, and Circumference

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

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.

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