Question

Figure EFGH on the grid below represents a trapezoidal plate at its starting position on a rotating surface.



The plate is rotated 90° about the origin in the counterclockwise direction. In the image trapezoid, what are the coordinates of the endpoints of the side congruent to side FG?

Answer 1

It's in the third quadrant, so everything there is negative. Right now it is in the second quadrant, which is (negative, positive). In other words, you want negative, positive to become negative, negative, which is a transformation of (-x,y) to (-x,-y) Good luck!