Can I have help how to do this question please?

Your task is to add code to these functions in circle facts.c: // Calculate the area of a circle, given its radius. double area (double radius) { // TODO: complete this function. return M_PI; // TODO: change this to the correct return value. } // Calculate the circumference of a circle, given its radius. double circumference (double radius) { // TODO: complete this function. return M_PI; // TODO: change this to the correct return value. } // calculate the diameter of a circle, given its radius. double diameter(double radius) { // TODO: complete this function. return M_PI; // TODO: change this to the correct return value. } Its main function is complete. Do not change the main function. Complete these three functions: double area (double radius); double circumference (double radius); double diameter(double radius); Hint use the constant M_PI defined in math.h $ dcc -o circle_facts circle_facts.c Resource created about.a. month ago, last modified 3.days..ago. website: https://cgi.cse.unsw.edu.au/-cs1511/21T1/ab/04/question Your task is to add code to these functions in circle facts.c: // Calculate the area of a circle, given its radius. double area (double radius) { // TODO: complete this function. return M_PI; // TODO: change this to the correct return value. } // Calculate the circumference of a circle, given its radius. double circumference (double radius) { // TODO: complete this function. return M_PI; // TODO: change this to the correct return value. } // calculate the diameter of a circle, given its radius. double diameter(double radius) { // TODO: complete this function. return M_PI; // TODO: change this to the correct return value. } Its main function is complete. Do not change the main function. Complete these three functions: double area (double radius); double circumference (double radius); double diameter(double radius); Hint use the constant M_PI defined in math.h $ dcc -o circle_facts circle_facts.c Resource created about.a. month ago, last modified 3.days..ago. website: https://cgi.cse.unsw.edu.au/-cs1511/21T1/ab/04/question Its main function is complete. Do not change the main function. Complete these three functions: double area (double radius); double circumference (double radius); double diameter(double radius); Hint use the constant M_PI defined in math.h $ dcc -o circle_facts circle_facts.c $ ./circle_facts Enter circle radius: 1 Area = 3.141593 Circumference = 6.283185 Diameter = 2.000000 $ ./circle_facts Enter circle radius: 17 Area = 907.920277 Circumference = 106.814150 Diameter = 34.000000 $ ./circle_facts Enter circle radius: 0.0125 Area = 0.000491 Circumference = 0.078540 Diameter = 0.025000 Resource created about a month ago last modified 3 days ago website: https://cai cse unsw.edu au-S 1511/21 11