Question

Triangle ABC is being rotated 90° about the

origin. What will A' be if A was located at (7. 2)?

Answer 1

A' (2, - 7 )

Explanation:

under a rotation about the origin of 90°

a point (x, y ) → (y, - x ) , then

A (7, 2 ) → A' (2, - 7 )