Question

Rotate the given triangle 90°

Answer 1

Answer:

Step-by-step explanation:

Answer 2

9514 1404 393

Answer:

  $\left[\begin{array}{ccc}0&-1&-2\\0&-3&5\end{array}\right]$

Step-by-step explanation:

The rotation matrix for 90° CCW is ...

  $\left[\begin{array}{cc}0&-1\\1&0\end{array}\right]$

Then the rotated coordinates are ...

  $\left[\begin{array}{ccc}0&-1\\1&0\end{array}\right]\cdot\left[\begin{array}{ccc}0&-3&5\\0&1&2\end{array}\right]=\left[\begin{array}{ccc}0&-1&-2\\0&-3&5\end{array}\right]$

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The transformation of each ordered pair is ...

  (x, y) ⇒ (-y, x)