Odpowiedź:
a)
A = (10 , 12 ) , S = ( 2 , 1 ) , B = (xb , yb)
xa = 10 , xs = 2 , ya = 12 , ys = 1
xs = (xa + xb)/2
2 * xs = xa + xb
xb = 2 * xs - xa = 2 * 2 - 10 = 4 - 10 = - 6
ys = (ya + yb)/2
2 * ys = ya + yb
yb = 2 * ys - ya = 2 * 1 - 12 = 2 - 12 = - 10
B = (- 6 , - 10 )
b)
A = (12 , - 10) , S = (- 5 , - 3 ) , B = (xb , yb)
xa = 12 , xs = - 5 , ya = - 10 , ys = - 3
xb = 2 * xs - xa = 2 * (- 5) - 12 = - 10 - 12 = - 22
yb = 2 * ys - ya = 2 * (- 3) + 10 = - 6 + 10 = 4
B = (- 22 , 4 )