Why is the center of a circle often given as (h, k)?
April 17, 2014 10:21 AM Subscribe
Why are the letters 'h' and 'k' often used to represent the center of a circle in the standard equation of a circle:
(x - h)2
+ (y - k)2
are 'h' and 'k' short for something? I might guess 'h' is short for 'horizontal', but I can't imagine what 'k' is for.
posted by Reverend John to Science & Nature (16 answers total) 2 users marked this as a favorite
So why do we use (h, k) rather than (a, b) or some other pair of letters? My Googleing shows I'm not the first person to wonder this, but no one seems to have received a good answer.