Plane geometry

9000106807

Level: 
C
Consider the points A=[0;5], B=[6;1], C=[7;9] and the triangle ABC. Find the direction vector of the line which is the perpendicular bisector of the side b (i.e. the line through the midpoint of the side AC which is perpendicular to the segment AC).
(4;7)
(7;4)
(7;9)
(7;9)

9000106808

Level: 
C
Consider the points A=[0;5], B=[6;1], C=[7;9] and the triangle ABC. Find the direction vector of the line which is the bisector of the angle ACB (i.e. the line which splits the internal angle at the point C into two angles with equal measures).
(2;3)
(6;4)
(7;9)
(7;8)