Question

To facilitate a quick getaway, the cunning thief parked the car perpendicular the building.

Answer 1

The correct preposition that you should add to make the sentence correct is TO. The answer is then "To facilitate a quick getaway, the cunning thief parked the car perpendicular to the building". Perpendicular things always have the preposition TO next to them.

Answer 2

^^their right^^

ik i could have just commented but im extra

(also i just took the test it is confirmed their right)