#P28. 【例7.2】与圆相关的计算
【例7.2】与圆相关的计算
Description
Given the radius of a circle, find its diameter, circumference, and area.
If the radius of the circle is , then the diameter, circumference, and area are , , and respectively, where .
Input Format
Input consists of a single real number (), representing the radius of the circle.
Output Format
Output a single line containing three numbers, representing the diameter, circumference, and area of the circle, separated by a space, each with decimal places.
Sample
3.06.0000 18.8495 28.2743