### Problem: circle area and perimeter

Write a program that reads from the console a number r and calculates and prints the circle's area and perimeter with radius r.

#### Input and output

Input Output
3 Area = 28.2743338823081
Perimeter = 18.8495559215388
4.5 Area = 63.6172512351933
Perimeter = 28.2743338823081

#### Hints and Guideliness

For the calculations you may use the following formulas:

• Area = Math.PI * r * r.
• Perimeter = 2 * Math.PI * r.