The Circle
The Circle. The distance from ( a,b ) to ( x,y ) is given by r 2 = (x - a) 2 + (y - b) 2. (x , y). Proof. r. (y – b). (a , b). (x , b). By Pythagoras. (x – a). r 2 = (x - a) 2 + (y - b) 2. OP has length r. r is the radius of the circle. c. b. a. a 2 +b 2 =c 2. P(x,y).
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