Answer:
see attached
Step-by-step explanation:
Rotation 270° counterclockwise is equivalent to rotation 90° clockwise. The transformation of coordinates involved is ...
(x, y) ⇒ (y, -x)
The coordinates of the rotated figure are ...
A(-2, 1) ⇒ A'(1, 2)
B(1, 2) ⇒ B'(2, -1)
C(-2, 4) ⇒ C'(4, 2)
The rotated figure is graphed in red in the attachment.
