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- Prepare
- Tutorials
- 10 Days of Javascript
- Day 1: Let and Const

# Day 1: Let and Const

# Day 1: Let and Const

**Objective**

In this challenge, we practice declaring variables using the *let* and *const* keywords. Check out the attached tutorial for more details.

**Task**

- Declare a
*constant variable*, , and assign it the value*Math.PI*. You will not pass this challenge unless the variable is declared as a constant and named`PI`

(uppercase). - Read a number, , denoting the radius of a circle from stdin.
- Use and to calculate the and of a circle having radius .
- Print as the first line of output and print as the second line of output.

**Input Format**

A single integer, , denoting the radius of a circle.

**Constraints**

- is a floating-point number scaled to
*at most*decimal places.

**Output Format**

Print the following two lines:

- On the first line, print the of the circle having radius .
- On the second line, print the of the circle having radius .

**Sample Input 0**

```
2.6
```

**Sample Output 0**

```
21.237166338267002
16.336281798666924
```

**Explanation 0**

Given the radius , we calculate the following:

We then print as our first line of output and as our second line of output.