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Engineering · Computer Science
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The following formula gives the distance between two points, (x1, y1) and (x2, y2) in the Cartesian plane:

 

 

Given the centre and a point on the circle, you can use this formula to find the radius of the circle. Write an interactive   C program that prompts the user to enter the centre and a point on the circle. The program should then output the circle’s radius, diameter, circumference, and area. Your program must have at least the following functions:

a. distance: This function takes as its parameters four numbers that represent two points in the plane and returns the distance between them. 

b. radius: This function takes as its parameters four numbers that represent the centre and a point on the circle, calls the function distance to find the radius of the circle, and returns the circle’s radius.

c. circumference: This function takes as its parameter a number that represents the radius of the circle and returns the circle’s circumference. (If r is the radius, the circumference is 2πr)

d. area: This function takes as its parameter a number that represents the radius of the circle and returns the circle’s area. (If r is the radius, the area is πr2.) Assume that π = 3.1416.

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