Question

Find the coordinate of G' after a 90° counterclockwise rotation of the triangle about the origin.

Answer 1

G'(1, 3)

Explanation:

Counterclockwise rotation 90°: (x, y) ⇒ (-y, x)

So the point G is transformed to ...

... G(3, -1) ⇒ G'(1, 3)