Question

What are the new coordinates of these pre-image points after a 270° CCW rotation? A (-3,2), B (4-7), C (-9,-8) A' (-3. 2). B' (4. -7), C (-9.-8)

Answer 1

We have the following:

270° CCW rotation = 90° CW

$90CW(x,y)\rightarrow(y,-x)$

therefore:

$\begin{gathered} A(-3,2)\rightarrow A^{\prime}(2,3) \\ B(4,-7)\rightarrow B^{\prime}(-7,-4) \\ C(-9,-8)\rightarrow C^{\prime}^{}(-8,9) \end{gathered}$

Therefore, the answer is the last option D.