Question

Write a program in C which reads a real number representing the radius of a circle. The program will then print out the area of the circle using the formula: area = π*r*r, you need to use π to 10 decimal places is 3.1415926535. Also, declare π as a named constant.

Input Format

5

Constraints

Print area upto 10 decimal places.
Radius should also be in double.

Output Format

78.5398163375

Sample Input 0

5
Sample Output 0

78.5398163375

Answer 1

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Answer 2

Answer:

Iourkeyite94irukyri3 Iruketu35it7lydjw4635iryh4wu3 8tujtey53itykrsy5eufyjtshr6ifyri