Question

The vertices of the quadrilateral are upper A at left parenthesis negative 2 comma 1 right parenthesis, upper B at left parenthesis 1 comma 1 right parenthesis, upper C left parenthesis 1 comma negative 1 right parenthesis, and upper D at left parenthesis negative 2 comma negative 1 right parenthesis.Imagine a counterclockwise rotation of 270°
270
°
about the origin of the figure. Choose the coordinate of A′
𝐴
′
.

(1 point)
Responses

(1,2)
(
1
,
2
)

left parenthesis 1 comma 2 right parenthesis

(1,1)
(
1
,
1
)

left parenthesis 1 comma 1 right parenthesis

(2,−1)
(
2
,
−
1
)

left parenthesis 2 comma negative 1 right parenthesis

(−1,−2)

Answer 1

Rotation 270° counterclockwise sends (x,y) to (y, −x). For A(−2,1) this gives A′ = (1, −(−2)) = (1,2).