The final clue was carved on the chest:

: Memindahkan setiap titik dengan jarak dan arah yang sama. Jika titik ditranslasikan oleh , maka bayangannya adalah

Q'(x', y') = Q(x, -y)

The third challenge was to reflect a triangle across the x-axis. Andi quickly realized that this would flip the triangle upside down and carefully drew the new position. The guardian nodded and presented her with the final challenge.