## Detailed description

Cartesian plane. Line drawn through points *A*, *B,* *P* and *Q*. *AX* and *PY *horizontal dotted segments. *BX* and *QY* vertical dotted segments. Right-angles marked at *X* and *Y*.

Cartesian plane. Line drawn through points *A*, *B,* *P* and *Q*. *AX* and *PY *horizontal dotted segments. *BX* and *QY* vertical dotted segments. Right-angles marked at *X* and *Y*.