Hi there! I need to write a function called intersect so that the program i have determines if 2 circles intersect. The first circle has centre (px,py) with radix pr and the second circle has centre (qx,qy) with radix qr. I have no idea how to go about with this or where to start. Any ideas? Thanks a bunch :)

```
#include <stdio.h>
#include <math.h>
// Put your function intersect here.
int main(){
double px,py,pr,qx,qy,qr;
while(1){
printf("radix 1: ");
scanf("%lf",&pr);
if(pr < 0.0) break;
printf("centre 1 {x,y}: ");
scanf("%lf%lf",&px,&py);
printf("radix 2: ");
scanf("%lf",&qr);
printf("centre 2 {x,y}: ");
scanf("%lf%lf",&qx,&qy);
if(intersect(px,py,pr,qx,qy,qr))
printf("The circles intersect.\n\n");
else
printf("The circles do not intersect.\n\n");
} return 0;
)
```