Question

To show that the rectangle in Quadrant III is congruent to the rectangle in Quadrant I, Darnell rotates the first rectangle 90 degrees clockwise into Quadrant II. What is his next step

Answer 1

Reflect it across the y‑axis (the line x = 0). A 90° clockwise rotation is an isometry and so is a reflection, so the reflected rotated rectangle lands in Quadrant I and is congruent to the original.