Question

A triangle has the vertices at A(1,3), B(4,2), and C(3,8). What transformation would produce an image with the vertices A’(3,-1),B’(2,-4), C’(8,-3)?

A) Reflection over the x axis

B) Reflection over the line y=x

C) Rotation 90° CW about the origin

D) Rotation 180° about the origin

Answer 1

C

Explanation:

Answer 2

9514 1404 393

Answer:

C) Rotation 90° CW about the origin

Explanation:

The transformation for rotation CW 90° is ...

(x, y) ⇒ (y, -x)

This is apparently the transformation that gets ...

A(1, 3) ⇒ A'(3, -1)

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Additional comment

Attached is a list of the commonly used transformations for your reference.