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