Math(transformation).

[Brains]

Does anyone know how to find the centre of rotation without drawing the perpendicular bisector? Because these questions are only of one mark and we can't our time in drawing these.

 

[OakMoon!]

There is enough time. There is a way of counting squares and going around, which is done by ur mind. But the best way is to draw rough perpendicular bisector while showing the lines. Like this ur working is also shown. It doesnt take time once u r well practiced.

 

[UxaiR]

hamidali is excatly right
there are many ways by which we could find centre of rotaion but if you need even one mark in that question you need to do full procedure of perpendicular bisector otherwise you wont be given any marks i readthis i a certain marking scheme
and secondly it doesnt take much time just couple of minutes

 

[Tra]

To find the centre of rotation, we must draw 2 perpendicular bisectors of 2 pairs of corresponding sides, isn't it?
Just confirming!xD

 

[XPFMember]

yes u r right!