### Home > GC > Chapter 1 > Lesson 1.3.1 > Problem1-102

1-102.

Copy $ΔABC$ below on graph paper. 1-102 HW eTool (Desmos). Homework Help ✎

1. Rotate $ΔABC$ $90°$counter-clockwise ($\circlearrowleft$) about the origin to create $ΔA^\prime B^\prime C^\prime$. Name the coordinates of $C^\prime$.

2. Reflect $ΔABC$ across the vertical line $x = 1$ to create $A''B''C''$ .

3. Translate $ΔABC$ so that $A'''$ is at $(4, −5)$. Name the coordinates of $B'''$.

See 1-60 and the Math Notes box for Lesson 1.2.2 (page 34 in the student text) for help with rotations.