Question

A rectangle was rotated 270° about the origin. The image is shown. Which points are vertices of the pre-image? Check all that apply. K(–3, –1) M(–3, 2) M(3, 2) N(–3, 1) N(3, 1)

Answer 1

C and E

Edge 2021

Answer 2

M(3, 2) and N(3, 1)

Explanation:

A rectangle was rotated 270° about the origin.

Since it doesn't mention which direction, we will review both clockwise and anti-clockwise rotation.

See attached where top rectangle represents the pre-image before anti-clockwise and bottom one - before clockwise rotation.

Now let's check the points given:

K(–3, –1)

• No

M(–3, 2)

• No

M(3, 2)

• Yes, top one

N(–3, 1)

• No

N(3, 1)

• Yes, top one

So based on correct points of pre-image we can state it was rotation anti-clockwise