Question

What is the ordered pair of C' after point C (1, 2) is rotated 90° clockwise?

C' (-1,2)

C (1, -2)

C' (2, 1)

C' (2, -1)

Answer 1

I believe it would be the 4th C

Answer 2

C' (2, -1)

Explanation:

C (1, 2) is rotated 90° clockwise

(y,-x)

When a point (x,y) is rotated 90 degree clockwise, the point (x,y)

becomes (y,-x). Interchange the x and y values, multiply x by -1

point rotated 90 degree clockwise (x,y) -> (y,-x)

C (1, 2) is rotated 90° clockwise (1,2) -> (2,-1)

C' (2, -1)