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distance formula
square root of: (x2-x1)2 + (y2-y1)2
midpoint
((x1+x2)/2) + ((y2-y1)/2)
equation of a circle with center (a,b) & radius r
(x-a)2 + (y-b)2 =r2
equation of a line through point (x1,y1) with slope m
y-y1=m(x-x1)
equation of a line with slope m & y-intercept b
y= mx+b
x of y cards