Question

Write a rule to describe the transformation.

A. rotation 180º about the origin
B. reflection across y=x
C. rotation 90º clockwise about the origin
D. rotation 90º counterclockwise about the origin

Answer 1

A. rotation 180º about the origin

Explanation:

Taking two points:

Old coordinates:

Q(2,0), F(2,4)

New coordinates:

Q'(-2,0), F(-2,-4)

The rule is:

(x,y) -> (-x,-y)

Which describes a rotation of 180º about the origin, and the correct answer is given by option a.