Maths?????

Rotation – Graphs and Enlargement

90°

180°

270°

Clockwise

(y,-x)

(-x,-y)

(-y,x)

Anti-Clockwise

(-y,x)

(-x,-y)

(y,-x)

If you have to rotate a point 90° clockwise then you have to change the co-ordinates. So for example the co-ordinates of a point is (2,1) and it has to be rotated 90° clockwise, which means the new co-ordinates are (1,-2). But how? Well in the original point: 2 is the ‘x’ co-ordinate (According to the standard form of co-ordinates which is (x,y)) and ‘y’ is 1. So according to that the new co-ordinate is (1,-2)

Cheers,
by Vineel - 8A