Determining the centre of rotation
Answer Text: Determining the centre of rotation-When an object and its image are given, then to find the Centre of rotation, we proceed as follows: Illustration. If triangle ABC in which A (1,1),B(1,5) and C(4,5) is mapped onto A’(-1,1) B’(-5,1) and C’(-5,4)To find the center of rotation.-Draw a segment connecting point’s A and A' -Using a compass, find the perpendicular bisector of this line.-Draw a segment connecting point’s B and B'.Find the perpendicular bisector of this segment.-The point of intersection of the two perpendicular bisectors is the center of rotation.-Label this point P.