Example 1 · level 1
A mirror is held along the dashed line to the right of the question figure. Which answer figure is its mirror image?
- A
- B
- C
- D
Show solution
- In a mirror image every point keeps its height and moves to the same distance on the other side: (x, y) → (3 − x, y).
- The arrowhead at (1, 2) goes to (2, 2), and every stroke moves the same way.
- Only figure (C) has every part in its reflected place, so the answer is (C).
Answer: C