### Home > CCG > Chapter 8 > Lesson 8.1.2 > Problem8-20

8-20.

Crystal is amazed! She graphed $\Delta ABC$ using the points $A(5, −1), B(3, −7)$, and $C(6, −2)$. Then she rotated $\Delta ABC \: 90°$ counterclockwise $(\circlearrowleft)$ about the origin to find $\Delta A^\prime B^\prime C^\prime$. Meanwhile, her teammate took a different triangle $(\Delta TUV)$ and rotated it $90°$ clockwise $(\circlearrowright)$ about the origin to find $\Delta T^\prime U^\prime V^\prime$. Amazingly, $\Delta A^\prime B^\prime C^\prime$ and $\Delta T^\prime U^\prime V^\prime$ ended up using exactly the same points! Name the coordinates of the vertices of $\Delta TUV$.

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Click the link at right for the full version of the eTool: 8-20 HW eTool (Desmos)