CPM Homework Help : CCG Problem 5-130

Triangle A prime, B prime, C prime is, graphed. A prime (negative 4, comma negative 2), B prime (negative 2, comma negative 6), and C prime (negative 5, comma negative 4). $ΔABC$ was reflected across the $x\text{-axis}$ , and then that result was rotated $90º$ clockwise about the origin to result in $ΔA'B'C'$ , shown at right. Find the coordinates of points $A$ , $B$ , and $C$ of the original triangle.

Hint:

To undo the transformation, rotate $ΔA'B'C'$ $90º$ counter-clockwise then reflect the result across the $x\text{-axis}$ .

Answer:

$A(2,4)$ , $B(6,2)$ , $C(4,5)$

Use the eTool below to explore the process of undoing the transformation.
Click the link at right for the full version of the eTool: 5-130 HW eTool