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const PI = Math.PI;
let r = parseFloat(readLine());
// Print the area of the circle:
let area = PI * r * r;
console.log(area);
// Print the perimeter of the circle:
let perimeter = 2 * PI * r;
console.log(perimeter);
Day 1: Let and Const
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const PI = Math.PI; let r = parseFloat(readLine()); // Print the area of the circle: let area = PI * r * r; console.log(area); // Print the perimeter of the circle: let perimeter = 2 * PI * r; console.log(perimeter);