Problem: Circle Area and Perimeter

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

Input and Output

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

Video: Circle Perimeter and Area

Watch the video lesson about calculating circle perimeter and area:

Hints and Guidelines

For the calculations you may use the following formulas:

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

Testing in the Judge System

Test your solution here:

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