2010-02-10 01:02:08 +0000 #1

2010-02-10 01:09:33 +0000 #2

(1) first started with A, B

2:00 find the equation of a circle (2) re-established P coordinates (X, Y), M (X1, Y1)

(3) because P is a MN midpoint, so (X1 +4) divided by 2 is equal to X, (Y1-2) divided by 2 equals Y

(4) X-said X1, with Y1, said Y, so 2X-4 is equal to X1, 2Y +2 is equal to Y1

(5) because the X1, Y1 are round, so on behalf of the equation into the circle get on the trajectory of equation of P

2:00 find the equation of a circle (2) re-established P coordinates (X, Y), M (X1, Y1)

(3) because P is a MN midpoint, so (X1 +4) divided by 2 is equal to X, (Y1-2) divided by 2 equals Y

(4) X-said X1, with Y1, said Y, so 2X-4 is equal to X1, 2Y +2 is equal to Y1

(5) because the X1, Y1 are round, so on behalf of the equation into the circle get on the trajectory of equation of P