Chapter 12.6, Problem 2E

To determine

To describe: the ${90}^{\circ }$ counterclockwise rotation using coordinate notation.

Explanation of Solution

Given information :

Coordinate notation.

the ${90}^{\circ }$ counterclockwise rotation using coordinate notation,

In ${90}^{\circ }$ counterclockwise rotation switch the coordinates, then multiply the new x -coordinate by -1 .

  $\left(x,y\right)\to \left(-y,x\right)$