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**HackerRank Day 1: Let and Const 10 days of javascript problem solution**Declare a constant variable, PI, 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, r, denoting the radius of a circle from stdin.

Use PI and r to calculate the area and perimeter of a circle having radius r.

Print area as the first line of output and print perimeter as the second line of output.

## Problem solution in JavaScript programming.

function main() { // Write your code here. Read input using 'readLine()' and print output using 'console.log()'. const PI = Math.PI; let r = readLine(); function area(PI,r) { area = PI * (r *r); console.log(area); } function perimeter(PI,r) { perimeter = 2 *PI * r ; console.log(perimeter); } // Print the area of the circle: area(PI,r); // Print the perimeter of the circle: perimeter(PI,r);

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