circle algorithm question

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Code:

#define PI 3.141592

dim as double radians
dim as integer cx, cy, r, numPoints, px, py

screen 14

cx=150
cy=120
r=100
numPoints=10

for radians=0 to PI*2 step PI*2/numPoints
    px=cx+cos(radians)*r
    py=cy-sin(radians)*r
    pset(px,py)
    'or save coordinates here
    'subtract cx and cy from px and py respectively to get
    'coordinates relatively from (0, 0)
next radians

sleep