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function main() {
// Write your code here. Read input using 'readLine()' and print output using 'console.log()'.
const PI = Math.PI; // Math.P****I means (π=Math.PI)
let r = readLine();
// Print the area of the circle:
console.log(PI * (r2)); //the area of the circle means = πr^2
// Print the perimeter of the circle:
console.log(2*PI*r); //the perimeter of the circle means =2πr
Day 1: Let and Const
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function main() { // Write your code here. Read input using 'readLine()' and print output using 'console.log()'. const PI = Math.PI; // Math.P****I means (π=Math.PI) let r = readLine(); // Print the area of the circle: console.log(PI * (r2)); //the area of the circle means = πr^2 // Print the perimeter of the circle: console.log(2*PI*r); //the perimeter of the circle means =2πr